ML19338G492
| ML19338G492 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 09/04/1980 |
| From: | Crane P PACIFIC GAS & ELECTRIC CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-80-17, NUDOCS 8010300386 | |
| Download: ML19338G492 (2) | |
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P.A.C I F I C G-A S AND ELECTR,IC C O M PANY OWb 77 DEALE STREET. 31ST FLOOR f'[S $t C O. C AU TO R NI A 94106 * (415) 781 4211
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Mr.
P. H. Engelken, Director
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rf;;;f..ef Office of Inspection-and Enforcement Region V U. S.-Nuclear Regulatory Commission 1990 North California Boulevard Walnut Creek Plaza, Suite 202 Walnut Creek, California 94596 Re:
Docket No. 50-133 License No. DPR-7
Dear Mr. Engelken:
This is in response to your letter dated August 22, 1980, which transmitted I.E. Bulletin No. 80-17 Supplement 3 concerning failures of control rods to insert during a scram at a BWR.
Item 1 of the subject bulletin required certain proce-dures to be developed for "those plants in which the scram dis-charge volume headers are connected to the instrument volume by a2 inch pipe.
This requirement is not applicable to the Humboldt Bay nuclcar unit.
The plant design uses only a single scram discharge volume which is instrumented for level alarms and a high level scram signal.
Item 2 requested us to provide and implement procedures which require a functional test using water for the instrument volume level alarm, rod block and scram switches after each scram event, before returning to power.
This procedure should remain in effect until modifications in addition to Item B.l. of IEB 80-17 Supplement No. 1 are completed to substantially increase reliability of water level indication in the scram discharge volume (s).
The plant is presently in the cold shutdown mode and will renain there until completion of the ongoing geologic investigation.
The review, applicable testing, and resolution of any problems will be performed following completion of the geologic investigation and a report of our findings will be forwarded prior to returning 1.o i
. power operat on.
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1 Mr. - R. II. Engelken 2
September 4, 1980 It is estimated that approximately 1 man-hour has been ex-f pended to~roview and respond to the subject bulletin.
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- manpower expended for the final resolution of this bulletin and for corrective action will be repoi-ted when those actions are taken.
Very truly yours,
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Director Office of Inspection and Enforcement Division of Reactor Operations Inspection 1
U. S. Nuclear Regulatory Commission Washington, D.
C.:20555 Director Document Management Branch U. S. Nuclear Regulatory Commission Washington, D. C. 20555 3
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