ML20079A964

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Forwards Beaver Valley Power Station Evaluation of Adequacy of Existing Neutron Flux Instrumentation for NUREG-0737,Suppl 1. Rept Submitted in Lieu of Upgrading Instrumentation Per Rev 2 to Reg Guide 1.97
ML20079A964
Person / Time
Site: Beaver Valley
Issue date: 05/31/1991
From: Sieber J
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20079A965 List:
References
RTR-NUREG-0737, RTR-NUREG-737, RTR-REGGD-01.097, RTR-REGGD-1.097 TAC-51071, NUDOCS 9106120003
Download: ML20079A964 (2)


Text

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U. S. Nuclear Pegulatory Commission Attn: Document Control Desk i Washington, DC 20555 l l

l Subjects lleaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. 1)PR-66 Neutron Flux Monitoring Instrumentation Regulatory Guide 1.97 (TAC NO. 51071)

Reft Evaluation of the Adequacy of Exinting Neutron Flux Inntrumentation for NUREG-0737, Supplement 1 -

May 1991 This letter submits the referenced report which provides a technical bania for the use of the existing neutron monitoring instrumentation to meet the requirements of NUREG 0737, Supplement 1, in lieu of upgrading the instrumentation to the Category 1 criteria recommended in Regulatory Guide 1.97, Revision 2.

The report presents the results of a saiety assessment of design basis and beyond design basis accident analyses. The safety assessment determined that accident diagnosis and plant recovery can be successfully accomplished using Emergency Operating Procedurou (EOPs). The EOPs provide a systematic method to explicitly determine the status of the Subcriticality Critical Safety function during normal and adverse containment conditiont.. On this basis, the report detorpines that no sa19ty benefit or increased protection will result from upgrading the existing neutron flux monitoring instrumentation. ,

Moreover, the report demonstrates that for certain dynamic accident conditions more suitable instrumentation exists to monitor the status of the core subcriticality (i.e., the neutron flux monitoring instrumentation would not be preferred for conditions of core voiding).

I Assuming that the NRC accepts the proposed method of post-accident neutron monitoring based on the technical merit of the evaluation, Duquesne Light company propocos that it will provide additional technical guidance to its operators through enhanced training. The training will be developed on the basis of the technical guidanco provided in the report as it applies to the existing EOPs.

The attached report was developed as a follow-up to the meeting l with the NRC on September 26, 1990. The meeting was held in response to lten b of November 20, 1989.

the NRC Safety Evaluation transmitted by letter dated Il 9106120003 GIO".I1 FDR ADOC K 05000334 1 P PDR

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Iloaver Valley Power' Station, Unit lio. 1 Docket llo. 50-334, Licenno tio. DPR-66 lieutron Flux Monitoring Instrumentation Regulatory Guide 1.97 (TAC 110. 51071)

Page 2 Should you have any questions regarding thin cubmittal, please contact Ed Coholich at (412) 393-5224.

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' / ice Pronident fluclear Group Attachment i

, cci Mr. J . 11e a ll , Sr. Resident Inspector Mr. T. T. Martin, llRC Region I Administrator  !

Mr. A. W. DeAgazio, Project Manager -

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