ML19322D365
| ML19322D365 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/31/1978 |
| From: | Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19322D357 | List: |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8002110805 | |
| Download: ML19322D365 (1) | |
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NUCLEAR REGULATorsY COWassiCN UrnYt3 sTAtts 4
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March 31', 1973 i.
Co i.t No. 50-320 j
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M.CRANOC4 F02: K.V.Seyfrit',a/3TechnicalPrograms,ROI,IE:HQ j
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- i p g E. C. McCabe, Jr., Acting Chief, 30&NS Branch, RI j.
E RO.'t:
- 0. H. Sternberg, Acting Chief RP Section No.1 I
RO&NS Branch, RI
'S.rdOECT:
j' THREE MILE ISLAND 2
, PRESSURIZER RELIEF VALVE CONTROL SYSTEM (AITSiF1467]H2)
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PM-13Cil-40 dated March 30, 1978, reported a reactor trip and blow-
&ren at Three Hile Island 2..The.cause of the trip was the loss of a veltal bus caused by an inverter failure. The cause of the inverter
??cilure is under investigation by the ifctnsca..The blowdoun, however, u.s caused by the. pressurizer Electromatic relief valve opening upon a I
';cs: of electrical powar to its control bistable.
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This relief valve does not appear to be a scfety-related cev onent ruid it cpens en a 1 of 1 logic-power arrangement producing a loss of creolant cendition.
j It is requested that the adequacy of the desiga cpprocch (i.e.,
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t i alve fciling open on loss of control pcear) be revicwd on 'an expedited j
i_*.sts for Etu facilities in gancral and T1.ree Mile Island in particular.
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Daniel M. Sternaerg, Acting Chief Reacter Projects Section No. 1 CONTACT:
D. H. Sternberg, RI (488-1256) 700458 o'i?/
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