05000369/LER-1981-160-03, /03L-0:on 810922,during Investigation of Upper Head Injection Surge Tank Hi/Lo Pressure Alarm,Nitrogen Over Pressure on Upper Head Injection Accumulator Was Found Below Tech Spec.Caused by Weeping Drain Valve.Valve Tightened

/03L-0:on 810922,during Investigation of Upper Head Injection Surge Tank Hi/Lo Pressure Alarm,Nitrogen Over Pressure on Upper Head Injection Accumulator Was Found Below Tech Spec.Caused by Weeping Drain Valve.Valve Tightened

ML20011A685
Person / Time
Site:	McGuire
Issue date:	10/22/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011A679	List: 05000369/LER-1981-160, Forwards LER 81-160/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-160-03, /03L-0:on 810922,during Investigation of Upper Head Injection Surge Tank Hi/Lo Pressure Alarm,Nitrogen Over Pressure on Upper Head Injection Accumulator Was Found Below Tech Spec.Caused by Weeping Drain Valve.Valve Tightened
References
LER-81-160-03L, LER-81-160-3L, NUDOCS 8110290285
Download: ML20011A685 (1)

LER-1981-160, /03L-0:on 810922,during Investigation of Upper Head Injection Surge Tank Hi/Lo Pressure Alarm,Nitrogen Over Pressure on Upper Head Injection Accumulator Was Found Below Tech Spec.Caused by Weeping Drain Valve.Valve Tightened

Event date:
Report date:
3691981160R03 - NRC Website

text

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Event eescairncN Ano raceAsts coasscuaNCs3 h t o 6 21 IWhile at 31% power, investigation of a "UHI surge tank hi/lo pressure" alarm l

i ITTT1 laf arnvered that the nitronen over pressure on the upper head injection (UHI)

I t o t. t f acetimulator had dropped below 1206 psig.

This violates T.S. 3.5.1.2 which is I l o i s t Ireportable pursuant to T.S. 6.9.1.13(b) and is similar to R.O. #369/81-57.

j ITTe~l 19 f nco the UMT svseem is nnqqive and is only used if a larce reactor coolant I

l o i r l Isvstem break occurs. and the system would have functioned nrnneriv if it had I

lois1Ibeen needed, the health and safety of the public were not affected.

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titotlA drain valve (Kerotest) on the UHT nitronen accumulator was found to be IisiiI"weepine".

Packine leakoffs on the UHT hydrnulic block valves niso ecmtributeI m Ito decreases in the UMT system.

The drain vnive uns richtened and its nine enti s i + 3 e lsealed.

Nitroeen was added to the accumulator and water was added to the PHT tater g l accumulator to increase the surge tank level.

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