ML20059G766

Requests Addl Info to Suppl Original Application W/Analysis & Explanation Re Operability Requirements for LPCI During RHR Shutdown Cooling Mode Operation

ML20059G766
Person / Time
Site:	Duane Arnold
Issue date:	10/29/1993
From:	Pulsifier R Office of Nuclear Reactor Regulation
To:	Leslie Liu ILLINOIS POWER CO.
References
TAC-M86364, NUDOCS 9311090074
Download: ML20059G766 (3)

Text

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Oda N, M Docket No. 50-331 Mr. Lee Liu Chairman of the Board and Chief Executive Officer Iowa Electric Light and Power Company Post Office Box 351 Cedar Rapids, Iowa 52406

SUBJECT:

DUANE ARNOLD ENERGY CENTER, REQUEST FOR ADDITIONAL INFORMATION, TECHNICAL SPECIFICATIONS CHANGE, LPCI OPERABILITY (TAC NO. M86364) l Initial review of the licensee application dated June 18, 1993, has been unable to resolve an issue related to the proposed addition of a footnote to the low pressure coolant injection (LPCI) technical specification (TS). The enclosed request for additional information seeks to supplement the original application with analysis and explanation concerning operability requirements for LPCI during residual heat removal shutdown cooling mode operation.

Another question seeks to determine the LPCI operability impact of a motor operated valve cited in a past inspection report which initiated the move to include the TS footnote. We are submitting this request for additional information (RAI) in order to continue our review.

Please pro"ide your response as soon as practical, in order for the staff to complete the review in a timely manner.

If additional information is required, please contact me at (301) 504-3016.

This request for information affects fewer than 10 respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, ORIGINAL SIGNED BY Robert M. Pulsifer, Project Manager Project Directorate III-3 Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosure:

DISTRIBUTION:

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Mr. Lee Liu uane Arnold Energy Center Iowa Electric Light and Power Company j

cc:

Jack Newman, Esquire Kathleen H. Shea, Esquire Newman and Holtzinger 1615 L Street, N. W.

Washington, D. C.

20036 Chairman, Linn County Board of Supervisors Cedar Rapids, Iowa 52406 Iowa Electric and Power Company ATTN: David L. Wilson Plant Superintendent, Nuclear 3277 DAEC Road Palo, Iowa 52324 Mr. John F. Franz, Jr.

Vice President, Nuclear Duane Arnold energy Center 3277 DAEC Road Palo, Iowa d52324 Mr. Keith Young Manager, Nuclear Licensing Duane Arnold Energy Center 3277 DAEC Road Palo, Iowa 52324 U. S. Nuclear Regulatory Commission Resident Inspector's Office Rural Route #1 Palo, Iowa 52324 Regional Administrator, RIII U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Stephen N. Brown Utilities Division Iowa Department of Commerce Lucas Office Building, 5th floor Des Moines, Iowa 50319 i

o REQUEST FOR ADDITIONAL INFORMATION DUANE ARNOLD ENERGY CENTER TECHNICAL SPECIFICATIONS CHANGE i

LPCI OPERABILITY (TAC NO. M86364)

BACKGROUND:

The application proposed adding a footnote specifying that the LPCI subsystem is considered operable during alignment to, and operation in, RHR shutdown cooling mode if capable of manual realignment to the LPCI mode. As discussed in the application, this revision responds to concerns raised in an inspection report (No. 50-331/89028(DRP)) which discussed the disposition of the minimum flow isolation valve (M0-1935) during shutdown cooling operation. The inspection reported that the valve was tagged de-energized and closed to

j prevent inadvertent draining of the reactor vessel. The inspector reported that the valve furnishes pump protection, preventing overheating (supported by UFSAR Section 5.4.7.2.6).

t In a letter referenced by the application (IELP NG-91-4028, December 26, 1991) the licensee committed to a Technical specification change to resolve the question (i.e., add the footnote).

1 1

Staff review of the application led to questions concerning the abilita to j

realign RHR to the LPCI mode from shutdown cooling in the event of a..CCA.

In a telephone communication (J. Kinsey (IELP) and J. Donoghue (NRC), October 13, i

1993) realignment discussion concentrated on the crosstie valve (M0-2010).

i All valve operations were assumed to be normal operations based upon the proposed change to the TS Section 3.5 Bases. Although the licensee provided l

j assurances that the realignment could be performed in about two minutes and i

that procedures accounted for the required operations, adequate safety justification is not available to conclude that LPCI is operable during RHR shutdown cooling operation.

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REQUEST:

1.

Furnish a safety evaluation of the LPCI subsystem requirement for LOCA i

response during shutdown cooling operation. Concentrate on LPCI 1

components and system performance needed to provide adequate core cooling for the worst case shutdown conditions of reactor vessel pressure and decay heat level.

i 2.

Explain the impact on LPCI operability of de-energizing the LPCI pump l

minimum flow isolation valve M0-1935.

Specify if the valve must be operated to satisfy the motor operated valve operability surveillance requirement of TS 3/4.5.

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