Circuit Failure Mode Likelihood Analysis (Task 10) - Revision history

User: /* FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1 */

2018-12-10T21:40:46Z

FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1

User: /* FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1 */

2018-12-10T21:40:13Z

FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1

User: /* Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE): Technical Resolution to Open Issues on Nuclear Power Plant Fire-Induced Circuit Failure (EPRI 3002009214 / NUREG/CR-7150 Volume 3) */

2018-11-30T15:04:49Z

Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE): Technical Resolution to Open Issues on Nuclear Power Plant Fire-Induced Circuit Failure (EPRI 3002009214 / NUREG/CR-7150 Volume 3)

User: /* Supplemental Guidance */

2018-11-27T21:11:07Z

Supplemental Guidance

User: /* Supplemental Guidance */

2018-11-26T21:01:03Z

Supplemental Guidance

User: /* FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1 */

2018-11-26T15:30:55Z

FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1

User: /* Supplemental Guidance */

2018-11-26T15:30:22Z

Supplemental Guidance

User: /* FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1 */

2018-11-26T15:28:52Z

FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1

User: /* FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1 */

2018-11-26T15:28:32Z

FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1

User: /* FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1 */

2018-11-26T15:24:45Z

FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1

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 '''Impact on NUREG/CR-6850 (EPRI 1011989) Guidance'''
-This guidance in FAQ 08-0047 provides clarification on the appropriate use of the “Exclusive Or” function listed in NUREG/CR-6850 Section 10.5.3.1, page 10-9, bullet list item number 3, and in Section 10.5.3.1, page 10-11, bullet list item number 4. [https://www.epri.com/#/pages/product/000000003002001989/ EPRI 3002001989 / NUREG/CR-7150 Volume 2], is silent on FAQ 08-0047 treatment and its continued applicability.  Therefore, FAQ 08-0047 consideration is still applicable when estimating hot short induced spurious operation probability using NUREG/CR-7150.
+This guidance in FAQ 08-0047 provides clarification on the appropriate use of the “Exclusive Or” function listed in NUREG/CR-6850 Section 10.5.3.1, page 10-9, bullet list item number 3, and in Section 10.5.3.1, page 10-11, bullet list item number 4. [https://www.epri.com/#/pages/product/000000003002001989/ EPRI 3002001989 / NUREG/CR-7150 Volume 2] is silent on FAQ 08-0047 treatment and its continued applicability.  Therefore, FAQ 08-0047 consideration is still applicable when estimating hot short induced spurious operation probability using NUREG/CR-7150.
 ===[https://www.epri.com/#/pages/product/000000000001026424/ Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE): Phenomena Identification and Ranking Table (PIRT) Exercise for Nuclear Power Plant Fire-Induced Electrical Circuit Failure (EPRI 1026424 / NUREG/CR-7150 Volume 1)]===

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 ===[https://www.epri.com/#/pages/product/000000000001019259/?lang=en-US FAQ 08-0047, Spurious Operation Probability, Section 15 of Supplement 1]===
-FAQ 08-0047 was proposed to clarify guidance on quantification of spurious operation probabilities for independent vs. dependent combinations.  NUREG/CR-6850 (EPRI 1011989) provided a calculational scheme for multiple spurious operation probabilities that implicitly assumed independence.  As such, it would overestimate the joint probability in cases where the spurious actuations exhibited dependence.
+FAQ 08-0047 was proposed to clarify guidance on quantification of spurious operation probabilities for independent vs. dependent combinations.  NUREG/CR-6850 (EPRI 1011989) provided a calculational scheme for multiple spurious operation probabilities that implicitly assumed independence.  As such, it would overestimate the joint probability in cases where the spurious operations exhibited dependence.
 '''Impact on NUREG/CR-6850 (EPRI 1011989) Guidance'''

@@ Line 78: / Line 78: @@
 ===[https://www.epri.com/#/pages/product/000000003002009214/ Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE): Technical Resolution to Open Issues on Nuclear Power Plant Fire-Induced Circuit Failure (EPRI 3002009214 / NUREG/CR-7150 Volume 3)]===
-This report provides technical recommendations to resolve long-standing issues related to evaluation of multiple spurious operations and deterministic post-fire safe shutdown analyses.
+While the scope of this report was focused on deterministic post-fire safe shutdown analyses, the technical considerations and insights can be used in support of assigning probability estimates to specific cable failure modes associated with fire-induced cable damage.
 '''Impact on EPRI 1011989 NUREG/CR-6850 Guidance'''

← Older revision		Revision as of 21:11, 27 November 2018
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	'''(The memos and letters dated June 14, 2013, December 16, 2013, February 12, 2014, and April 23, 2014 referenced interim guidance until the issuance of NUREG/CR-7150, Volume 2, in May 2014. NUREG/CR-7150, Vol. 2 should be referred to as the official guidance.)'''		'''(The memos and letters dated June 14, 2013, December 16, 2013, February 12, 2014, and April 23, 2014 referenced interim guidance until the issuance of NUREG/CR-7150, Volume 2, in May 2014. NUREG/CR-7150, Vol. 2 should be referred to as the official guidance.)'''
		+
		+	===[https://www.epri.com/#/pages/product/000000003002009214/ Joint Assessment of Cable Damage and Quantification of Effects from Fire (JACQUE-FIRE): Technical Resolution to Open Issues on Nuclear Power Plant Fire-Induced Circuit Failure (EPRI 3002009214 / NUREG/CR-7150 Volume 3)]===
		+
		+	This report provides technical recommendations to resolve long-standing issues related to evaluation of multiple spurious operations and deterministic post-fire safe shutdown analyses.
		+
		+	'''Impact on EPRI 1011989 NUREG/CR-6850 Guidance'''
		+	*Clarified circuit failure modes and terminology including: proper polarity, latching versus non-latching, high impact components, failure mode classification and GFEHS
		+	*Revised several PIRT panel positions following the conclusions of the PRA Expert Panel
		+	**Consideration of insulation type for the aggressor cable conductor is eliminated. This was eliminated due to the impracticality of tracking the conductor insulation for aggressor cables. As a result, the reported classifications are a function of the conductor insulation of the target conductor.
		+	**Classification of inter-cable hot shorts for thermoset insulated conductors from "implausible" to "plausible" based on the PRA expert panel probabilities that did not support a classification of "implausible"
		+	**Grouped single break ungrounded AC (from common CPT or distributed) with DC due to similarities in circuit failure type classification.
		+	**Classified inter-cable hot shorts for double break design with TP insulated conductors as "implausible" for latching and "incredible" for non-latching circuits. This classification was deferred until the PRA Expert Panel completed their estimation.
		+	*Developed technical design considerations for shorting switch applications
		+	*Disposition of secondary fires due to a fire-induced open circuited current transformer
		+	**Testing is documented in [https://www.nrc.gov/reading-rm/doc-collections/nuregs/contract/cr7228// NUREG/CR-7228, ''Open Secondary Testing of Window-Type Current Transformers'']

← Older revision		Revision as of 21:01, 26 November 2018
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−	The plot of the probability of spurious operation duration in Figure 6-4 for AC control circuits should replace the plot of AC duration (Figure 16-1 and Table 16-1) for FAQ 08-0051 in Section 16 of Supplement 1 to NUREG/CR-6850. In addition, Figure 6-5 for DC control circuits now provides the plot for DC duration. The spurious operation duration tables are found in EPRI 3002001989 / NUREG/CR-7150 Volume II:	+	The plot of the probability of spurious operation duration in Figure 6-4 for AC control circuits should replace the plot of AC duration (Figure 16-1 and Table 16-1) for [https://www.nrc.gov/reading-rm/doc-collections/nuregs/contract/cr6850/s1/ FAQ 08-0051 in Section 16 of Supplement 1 to NUREG/CR-6850]. In addition, Figure 6-5 for DC control circuits now provides the plot for DC duration. The spurious operation duration tables are found in EPRI 3002001989 / NUREG/CR-7150 Volume II:
	*Table 6-3 - Tabulated Spurious Operation Duration Conditional Probability Values for AC and DC Control Circuits		*Table 6-3 - Tabulated Spurious Operation Duration Conditional Probability Values for AC and DC Control Circuits

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 FAQ 08-0047 was proposed to clarify guidance on quantification of spurious operation probabilities for independent vs. dependent combinations.  NUREG/CR-6850 (EPRI 1011989) provided a calculational scheme for multiple spurious operation probabilities that implicitly assumed independence.  As such, it would overestimate the joint probability in cases where the spurious actuations exhibited dependence.
-Impact on NUREG/CR-6850 (EPRI1011989) Guidance
+'''Impact on NUREG/CR-6850 (EPRI1011989) Guidance'''
 This guidance in FAQ 08-0047 provides clarification on the appropriate use of the “Exclusive Or” function listed in NUREG/CR-6850 Section 10.5.3.1, page 10-9, bullet list item number 3, and in Section 10.5.3.1, page 10-11, bullet list item number 4.