ML20064E458

/01T-0 on 781101:util Was Informed by NRR of Nonconformance w/10CFR50 Append a Gen Design Criteria 54 & 56.Two Reactor bldg-to-torus Vacuum Breaker Lines Have Never Had Design Review by Nrc.Tech Spec Change Effective 781108

ML20064E458
Person / Time
Site:	Brunswick
Issue date:	11/14/1978
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20064E450	List: ML20064E448 ML20064E458
References
LER-78-082-01T, LER-78-82-1T, NUDOCS 7811170213
Download: ML20064E458 (3)

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DATE EVENT DESCAIPTION AND PRCS ABLE CONSE%iEN ES 10121 l ONRR in 'w'ashington informed Plant Management on November 1,1978, of an apparent l I o l a 1 i nonconformance with 10CFR50, Appendix A, General Design Criteria 54 & 56. This matterg I o I 41 l concerns the two reactor building-to-torus vacuum breaker lines and their ability to {

lo]5I Iprovide primary containment isolation. ONRR stated that they had nei'er properly l l0 l6 l l reviewed the vacuum breaker line design and; therefore, the twO lines were [

l o 17 l [ considered by thea. '.o be a condition not specifically considered in the safety [

Wsj l analysis report and therefore constitute a prompt notification with a written (cont.) 80 l

7 9 SYSTEM CAUSL CAUSE COMP. VALVE CODE CODE SUSCODE CCP"ONENT CODE sueCoOE SUeCODE o 9 l5 lD l@ [Bj@ l A l@ l Zl Zl Zl Zl Zl Zl@ ]@ @ @

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!812Il apparent nonconformance. Completion of the modification, assuming timely equipment l

[T , . ] l availability, should be in January, 1979. I l

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d LER CONTINUATION--l-78-82 .

Facility: ESEP Unit #1 Event Date: 11/1/78 EVENT DESCRIPTION A'D PROBASLE CONSEQUENCES (cont.)

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LER SUPPLEMENT 15 FORMATION -

LER NUMBER 1-78-82 EVENT DATE 11/1/78 The present reactor building-to-torus vacuum breaker arrangement consists of a 20-inch singer check valve in series with a normally open manual butterfly valve. Apparently, this does not completely satisfy the general desgin criteria.

A technical specification change was approved November 8, 1978. It requires the manual butterfly valves be closed unless a drywell pressure of -0.5 PSIG exists, the manual valves will be opened before containment or torus spray systems are operated, and an increased surveillance program will be performed during periods of low drywell pressure.

A modification is being developed to alter the existing system. A valve which will be normally closed and then open automatically on a drywell vacuum signal is the proposed system modification. (The description and corrective actions above pertain to both Unit No. 1 and Unit No. 2).