ML20247G704

SER Accepting Licensee Commitment to Install ex-core Neutron Flux Monitoring Instrumentation Meeting Requirements of Reg Guide 1.97,Rev 2,prior to Restart Following Fourth Refueling Outage

ML20247G704
Person / Time
Site:	Grand Gulf
Issue date:	07/21/1989
From:	NRC
To:
Shared Package
ML20247G685	List: ML20247G677 ML20247G704
References
RTR-REGGD-01.097, RTR-REGGD-1.097 NUDOCS 8907280156
Download: ML20247G704 (3)

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ENCLOSURE 1 p

SAFETY EVALUATION REPORT SYSTEM ENERGY RESOURCES, INC.

GRAND GULF NUCLEAR STATION UNIT NO. 1 l ' DOCKET NO. 50-416 CONFORMANCETOREGULATORYGUIDE1.92

1.0 INTRODUCTION

By letter dated February 6,1989, System Energy Resources, Inc. (SERI) submitted a change in the comitment on the installation of neutron flux monitoring: instrumentation to meet Operating License Condition 2.C.(36).

Operating License Condition 2.C.(36) requires that the licensee shall implement.the recommendations of Regulatory Guide (R.G.) 1.97, Revision 2, for neutron . flux monitoring prior to startup following the fourth refueling outage.

A3.1.97 recomends Category I neutron flux monitoring instrumentation to

. monitor, reactivity control. By letter dated July 1,1988, the licensee comitted to the installation of an in-core neutron flux monitoring system prior to startup following the fourth refueling outage. This comitment was accepted by NRC letter dated December 6,1988, " Amendment No.53 to Operating License No. NPF-29." The licensee has changed this comitment to the installation of an ex-core neutron flux monitoring system prior to startup following the fourth refueling outage.

2.0 EVALUATION The licensee has been actively pursuing engineering studies and procurement of an in-core neutron flux monitoring system. This effort included a cost / benefit analysis, a draft system performance specification and a review of outage impact for the installation of neutron flux monitoring instrumentation.

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The results of the cost / benefit analysis have shown that the cost effectiveness of an in-core system is questionable. The system implementation costs would not be sufficiently offset by long term system savings. The fourth refueling outage would be lengthened by a minimum of 2 to 3 additional days.

The licensee intends to meet the requirements of Operatir.g License Condition 2.C.(36). However, the licensee states that the most appropriate approach is the installation of an ex-core neutron flux monitoring system.

Operating License Condition 2.C.(36) does not specify a particular neutron flux monitoring system type. The licensee has made a commitment to install a system that complies with the Category 1 criteria of R.G.1.97. Therefore, the licensee's commitment change is acceptable.

Category i neutron flux monitoring systems that meet all the Category 1 criteria of R.G.1.97 have only recently become available to the industry. We find that the existing neutron flux monitoring instrumentation is acceptable for interim use. It is the staff's position that the licensee shall continue to provide the staff with quarterly updates on the progress of the neutron flux monitoring instrumentation installation effort.

3.0 CONCLUSION

Based on the above evaluation, the staff concludes that the existing neutron flux monitoring instrumentation is cceeptable for interim use.

It is the staff's position that the licensee's commitment to install ex-core neutron flux monitoring instrumentation prior to startup following the foerth refueling outage is acceptable. It is also the staff's position that the licensee shall continue to provice the staff with quarterly updates on the progress of the neutron flux monitoring instrumentation installation effort.

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