ML20210T983
| ML20210T983 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/01/1984 |
| From: | Jorgensen B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Paulson W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20210T938 | List: |
| References | |
| FOIA-86-266 NUDOCS 8606020144 | |
| Download: ML20210T983 (1) | |
Text
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i llarch 1, 1984 r
Memorandum For:
Walt Paulsen, NRR Project Manager - Palisades r
From:
B. L. Jorgetesen, Senior Resident Inspector - Palisades l
SUB.IECT:
MAIN $TTE1 SA) ETY VALVE SETPOINT DRIF'T (CROSBY RV'S) i t
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Attached is a clean copy of informat ion faxed earlier covering the relief valve setpoint drift reported per LER 83 '!4 (Attachment 1).
Also attached j
is additional information (Attachment 2) which I think points very strongly
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to the conclusion these Crosby relief valves can have their lif t settings I
affected by adjustments of the nozzle ring (to control leakage or adjust blowdown i
rate, for example).
l
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-The symetry of the 1981 and 1983 "as founds" about the intended serpoint shown i
on the figure is particularly striking. The 1981 "as founds" were actually I
taken afte'r nozzle ring adjustment to limit blowdown rate to a value com-patible with the capacity of the test rig then in use.
Spring tension was increased in 1981 to establish correct "as left" valves which were then forced out-of-spec on the high side by nozzle ring readjustment to the pre-test position.
This yielded the high 1983 "as founds", taken without prior l
nozzle ring adjustment because test rig capacity was increased in the interim.
l Note also Attachment 2 purports to find the valves are capable of performing i
their design function.
The more important question may be were they so i
capable through the 1981-1983 operating cycle, when seven valves would f
apparently still not have lifted at 1050 psig? The Tech. Spec. limit is about 1035 psig.
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i B. L. Jorgensen
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Senior Resident Inspector j
i I
Attachments j
4 B606020144 060516 ppR FOIA..
Pp MURPHYS6-266 4,1vt.
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