05000280/LER-2077-005, Failure of Reactor Coolant Flow Comparator to Trip
| ML19105A121 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 08/11/1977 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | O'Reilly J NRC/IE, Office of Nuclear Reactor Regulation |
| References | |
| LER 1977-005-00 | |
| Download: ML19105A121 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 2802077005R00 - NRC Website | |
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a 57 sa 60 61 68 69 74 75 ea EVEi\\!T DESCRIPTION
@llij lAt Cold Shutdown, in the course of routine testing, Reactor Coolant Flow Comparator J 7 es 80
@liJ LQ:£-2-414) failed to trip.
7 6 9 The two redundant systems were operational for the J
80
@Ei] l!,7quired two out of three low flow trip.
Previous test was satisfactory.
The I
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~:rective action implemented was to replace the comparator
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This conditio~ ~s reportable 80 per Technical Specification 6.6.2b(2).
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CAUSE
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@:rill l.AJtestingl;_ousE:._Hagan Single Sig~al Comparator Model 4111082-001 failed to trip due toJ 7.B 9 80
@NJ L_c.apacitor leakage.
Since these capacitors. have an expected life of 10 to 20 yea:.s, J
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this fai~apacitor has been in use for, approximately nine years, the (Co?t'd) j 7
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FORM OF
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7 8 9 80 ADDITIONAL FACTORS GEJ L The ~1ealth and safety of the public were not affected because the two operational _J 7
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~ ~unclant: comp1:rators would have initiated the required low flow trip, in that 7
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CAUSE DESCRIPTION (CONTINUED) probable cause was aging.
As per a Westinghouse Technical Bulletin (NSD-TB-75-14) dated October 21, 1975, these capacitors have no specific problem qf *a generic nature.
However, Westinghouse does recommend that these leaking capacitors be replaced with a premium grade or Tantalum capacitor, presently available, on an as-failed basis, instead of a general capacitor replacement program.
This cri-teria is presently observed-at Surry.
The present rate of capacitor failure is very low and any increase in this rate will require a re-evaluation of our capa-
_citor change-out policy.
ADDITIONAL FACTORS (CONTINUED) particular loop.
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RECEIVED DOCUMENT PF:OCESS!t!G UfJ!T
- 1911 AUG 15 AM 9 I 7