ML18010A936

Forwards SE Accepting Proposed Mod of Alternate mini-flow Sys for Charging/Safety Injection Pumps

ML18010A936
Person / Time
Site:	Harris
Issue date:	11/27/1992
From:	Le N Office of Nuclear Reactor Regulation
To:	Watson R CAROLINA POWER & LIGHT CO.
Shared Package
ML18010A937	List: ML18010A936 ML18010A938
References
TAC-M84620, NUDOCS 9212080148
Download: ML18010A936 (3)

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Docket No. 50-400 UNITED STATES NUCLEAR REGULATORY COMIVllSSION WASHINGTON, D.C. 20555 November 27, 1992 Hr.

R. A. 'Watson Senior Vice President Nuclear Generation Carolina Power

& Light Company Post Office Box 1551

Raleigh, North Carolina 27602

SUBJECT:

SAFETY EVALUATION REGARDING MODIFICATION OF THE ALTERNATE MINI-FLOW SYSTEM FOR CHARGING/SAFETY INJECTION PUMPS -

SHEARON HARRIS POWER PLANT, UNIT 1

(TAC NO.

M84620)

During the week of August 8,

1992, an NRC inspection was conducted to review the circumstances pertaining to a reported loss of the plant high-head safety injection (HHSI) that occurred on April 3, 1991, at the Shearon Harris Nuclear Power Plant (SHNPP).

This inspection (Inspection Report 50-400/92-201 issued on September 1,

1992) raised operability concerns for the SHNPP HHSI's alternate mini-flow (AHF) system.

In a letter dated August 14,

1992, NRC formally expressed these concerns to Carolina Power

& Light Company (CP&L) and met with the licensee on August 20, 1992, to discuss the operability of the HHSI ANF system.

By a letter dated September 8,

1992, CP&L provided a written response to the staff concerns and indicated that a design change to eliminate relief valves in the AMF system for the HHSI charging/safety injection (C/SI) pumps at the SHNNP was also being considered.

On September 15,

1992, CP&L indicated in a phone call to the staff, that the ANF system will be modified during the current refueling outage

and, on October 7,

1992, met with the staff to further discuss details of the ANF system modification.

As a result of the October 7, 1992, meeting, CP&L submitted specific details of the modification by letters dated October 9, and October 12,

1992, as supplemented by letters dated October 28, and November 5, 1992.

The modification would remove spring-loaded pressure relief valves from the AHF lines and 'replace them with 60 gallon-per-minute flow control orifices and add automated, logic.to control the opening and closing of motor operated isolation valves in:the lines.

The staff reviewed CP&L submittals and finds the modification to the AHF system for the HHSI's C/SI pumps to be acceptable, contingent upon the satisfactory completion of post-modification testing of the four motor-operated valves (HOVs) in the modified ANF system and verification and confirmation of assumptions as discussed in the enclosed safety evaluation.

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R. A. Watson November 27, 1992 Details of the NRC's assessment of CP&L's modification to the AHF system are described in the enclosed Safety Evaluation (SE).

CP&L's implementation of testing and verification and confirmation of assumptions as described in the SE should be documented and records maintained for possible future NRC audit.

Sincerely, ORIGINAL SIGNED BY:

Ngoc B. Le, Project Manager Project Directorate II-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation

Enclosure:

Safety Evaluation cc w/enclosure:

See next page DISTRIBUTION:

Docket File

'RC/Local PDRs PD II-1 Reading S.

Varga G. Lainas

S. Little N.

B.

Le OGC E.

Adensam F. Orr C. Doutt T. Scarborough H.

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L. Plisco, EDO E. Herschoff, R-II OFC NAME DATE LA:P

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/92 Document Name:

HAR84620.LTR

Mr.

R. A. Watson Carolina Power

& Light Company Shearon Harris Nuclear Power Plant, Unit 1

CC:

Mr. H.

Ray Starling Manager Legal Department Carolina Power

& Light Company P. 0.

Box 1551

Raleigh, North Carolina 27602 Resident Inspector/Harris NPS c/o U. S. Nuclear Regulatory Commission Route 1,

Box 315B New Hill, North Carolina 27562 Mr. Gerald E. Vaughn, Vice President Harris Nuclear Project Harris Nuclear Plant Post Office Box 165 New Hill, North Carolina 27562 Mr. H. A. Cole Special Deputy Attorney General State of North Carolina Post Office Box 629

Raleigh, North Carolina 27602 Public Service Commission State of South Carolina Post Office Drawer 11649

Columbia, South Carolina 29211 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 2900 Atlanta, Georgia 30323 Mr. C.

S. Hinnant Plant General Manager Harris Nuclear Plant Post Office Box 165 New Hill, North Carolina 27562 Mr. Dayne H. Brown, Director Division of Radiation Protection N.

C. Department of Environmental, Commerce

& Natural Resources Post Office Box 27687

Raleigh, North Carolina 27611-7687 Mr. R.

B. Starkey Vice President Nuclear Services Department Carolina Power

& Light Company Post Office Box 1551

Raleigh, North Carolina 27602