ML20151G333

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Discusses Rev 3 to Reg Guide 1.97,which Recommends That Category 2 Instrumentation Be Installed. Previous Commitment Amended to Propose Use of Existing Alternate Instrumentation to Provide Info on Component Cooling Water Flow
ML20151G333
Person / Time
Site: Maine Yankee
Issue date: 04/08/1988
From: Whittier G
Maine Yankee
To: Wessman R
Office of Nuclear Reactor Regulation
References
RTR-REGGD-01.097, RTR-REGGD-1.097 9679L-SDE, GDW-88-86, MN-88-41, NUDOCS 8804190336
Download: ML20151G333 (4)
v • d • e


Text

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MaineYankee

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REUABLE ELECTRCTY FOR LAAAE 64NCE 1972 EolSON oRIVE. AUGUSTA, MAINE 04330.(207) 622-4868 April 8,1988 HN-88-41 GDH-88-86 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C.

20555 Attention:

Mr. Richard H. Hessman, Project Director I-3 Division of Reactor Projects I/II i

References:

(a) License No. OPR-36 (Docket No. 50-309)

(b) Regulatory Guide 1.97, Rev. 3, May 1983 (c) USNRC Letter to HYAPCo dated March 13, 1986 - Emergency Response Capacility Conformance to Regulatory Guide 1.97, Rev. 3 (d) HYAPCo Letter to USNRC dated September 5, 1936 (HN-86-ill)

Subject:

Regulatory Guide 1.97, Rev. 3 Gentlemen:

Regulatory Guide 1.97, Rev. 3, recommends Category 2 instrumentation be installed to monitor the Component Cooling Hater (CCH) system flow to engineered safety features system ccuponents.

The purpose of this instrumentation is to be able to monitor the operation of the CCH system (Reference b).

In response to the NRC's request for additional information, Reference (c), on Maine Yankee's exceptions to certain recommendations of Regulatory Guide 1.97, we had agreed to install flow instrumentation on the primary component cooling (PCC) and secondary component cooling (SCC) water systems during the 1988 refueling outage, Reference (d).

Maine Yankee hereby amends that previous commitment by proposing to use existing alternate instrumentation which will provide equivalent information on CCH flow and tnus permit a determination of the PCC and SCC systems oparation. A description and justification for the alternate instrumentation is oresented in Attachment A.

It is our understanding that based on discussions with Mr. Barry Marcus of your staff, and his technical contractor, our proposed approach appears to meet the intent of the recommendation on CCH flow in Regulatory Guide 1.97, Rev. 3.

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8804190336 880408 PDR ADOCK 05000309 P

DCD 9679L-SDE

MaineYankee United States Nuclear Regulatory Commission Page Two Attention: Mr. Richard H. Hessman HN-88-41 He plan to upgrade the instrumentation as described herein to meet the requirements for Category 2 instrumentation for this Type D variable during this year's refueling outage, which begins October 15, 1988, unless you advise us to the contrary by August 15, 1988.

4 Thank you for your prompt consideration of this matter.

Very truly yours, MAINE YANKEE

.kh AV G. D. Whittier, Manager Nuclear Engineering and Licensing GDH/bjp Enclosure I

cc: Mr. Hilliam T. Russell Mr. Pat Sears Mr. Cornelius F. Holden 7

i 9679L-SDE

Mainevankee c

ATTACHMENT A Justification for Alternaie Instrumentation for Deteraining Component Cooling Hater (CCH) System Flow to ESF System Components The Haine Yankee CCH system consists of two similar, separate subsystems, PCC and SCC.

Each subsystem consists of the following major components:

Component cooling pumps - 2 Component cooling heat axchangers - 2 Surge tank - 1 Associated chemical additive tank, radiation monitor, pipes and valves The PCC and SCC systems, which are closed loop systems, both operate during normal plant operations providing cooling to cooling loads. Both systems supply redundant components required for core cooling following a loss of coolant accident.

Maine Yanket proposes to use the following alternate control room instrumentation that can provide an indication of flow in the PCC and SCC systems as recommended by Regulatory Guide 1.97, Rev. 3.

a.

Surge tank level - This instrument provides a gage indication of surge tank level on the Main Control Board (HCB).

A decrease in surge tank level would indicate leakage or a break in the PCC and SCC systems.

This instrument would be upgraded to meet the Category 2 requirements for instruments recommended in Regulatory Guide 1.97, Rev. 3.

b.

CCH pump motor indication - The emperage of each CCH pump is measured by Class IE instruments and displayed and alarmed on the HCB.

As depicted on the CCH pump curve (Figure 1), CCH pump brake horsepower (BHP) and by conversion, current, would tend to decrease if there was resistance to system flow due to blockage downstream of the pump or if the pump lost suction, c.

Individual cooling loads on CCH flow - The CCH flow to cooling loads associated with individual safety-related equipment can also bc assessed through the instrumented temperature alarms on affected safeguards equipment. A high temperature alarm for a safeguards cooling load would alert the operator to the possibility of unacceptable CCH system operation.

Furthermore, since the CQi oesig.1 flow to individual safety-related components varies with the equipment in service, measuring total system loop flow may not be indicative of overall system operation.

This alternate instrumentation, when upgraded as necessary, provides an equivalent indication of the adequacy of CCH system flow which can be used to monitor the system operation, 9679L-SDE

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