ML20155D634

Forwards NRC Stating Position on Exercising PORVs & PORV Block Valves to Help Resolve Unresolved Item Noted in 880908 Inservice Testing Meeting Summary

ML20155D634
Person / Time
Site:	McGuire, Mcguire
Issue date:	10/06/1988
From:	Hood D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
TAC-61271, TAC-61272, NUDOCS 8810110324
Download: ML20155D634 (3)

Text

,_ _-__-__

October 6, 1988 Docket Nos.:

50-369 and 50-370 Mr. H. 8. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

SUBJECT:

INSERVICE TESTING POSITION ON POWER-0PERATED RELIEF VALVES -

M;GUIRE NUCLEAR STATION, UNITS 1 AND 2 (TACS 61271 and 61272)

During an August 16, 1988, meeting on the McGuire pump and valve inservice testing (IST) program, NRC referenced p'ior correspondence on the Fort Calhoun Station for the NRC's position on exercising the power-operated relief valves (PORVs) and PORY Dlock valves.

A copy of that correspondence is enclosed.

The relevant position, stated on page 2 of the enclosure, is equally applicable to the McGuire IST program.

We trust the above position will assist in resolution of the associated unresolved item identified in our Septerrber 8,1988 IST Meeting Sunrnary (paragraph S.1, page 17) on McGuire.

Sincerely, Darl S. Hood, Project lianager Project Directorate 11-3 Division of Reactor Projects I/II

Enclosure:

NRC 12/1/87 letter to R. L. Andrews cc w/ enclosure:

See next page DISTRIBUTIO:

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\\,*****f Cetooer 6, 1988 Docket Nos.:

50-369 and 50-370 Mr. H. B. Tucker, Vice President Nuclear Production Deportinent Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

SUBJECT:

INSERVICE TESTING POSITION ON POWER-OPERATED RELIEF VALVES -

HCGUIRE NUCLEAR STATION, UNITS 1 AND 2 (TACS 61271 and 61272)

During an August 16, 1988, meeting on the McGuire pump and valve inservice testing (IST) program, NRC referenced prior currespondence on the Fort Calhour.

Station for the NRC's position on exercising the power-operated relief valves (PORVs) and PORY block valves. A copy of that correspondence is enclosed.

The relevant position, stated on page 2 of the enclosule, is equally applicable to the McGuire IST program.

We trust the above positioni will assist in resolution of the associated unresolved item identified in our September 8,1988 IST Meeting Sunnery (paragraph S.1, page 17) on McGuire.

Sincerely, y e Hy >

Darl S. Hood, Project Manager Project Directorate 11-3 Division of Reactor Projects I/!!

Enclosure:

NRC 12/1/87 letter to R. L. Andrews cc w/ enclosure:

See next page

Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station cc:

Mr. A.V. Carr, Esq.

Dr. John M. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 County Manager of Mecklenburg County Mr. Dayne H. Brown, cf.ief 720 East Fourth Street Radiation Protection Uranch Charlotte, North Carolina 28202 Division of Facility Services Department of Human Resources 701 Barbour Drive j

Mr. Robert Gill Raleigh, North Carolina 27603-2008 Duke Power Company Nuclear Productior. Departti,ent P. O. Box 33189 Charlotte, North Carolina 28242 I

J. Michael McGarry, !!!, Esq.

Bishop, Liberman, Cook, Purcell j

and Reynolds 1200 Seventeenth Street, N.W.

Washington, D. C.

20036 Sentur Resident Inspector c/o U.S. Nuclear Regulatory Conaission Route 4 Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Comission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 2

1 S. S. Kilborn Area Manager, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239 l

P. O. Box 355 Pittsburgh, Pennsylvania 15230 J

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1. "' 8 ENCLOSURE

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December 1,1987 Docket No. 285 Mr. R. L. Andrews Division manager - Nuclear Production Omaha Public Power District 1623 Harney Street Osaha, Nebraska 68102

SUBJECT:

NRC OPEN ITEMS AS A RESULT INSERVICE TESTING PROGRAM MEETING -

FORT CALHOUN STATION, UNIT 1 (TAC 54804)

As a result of meetings held with you on October 14 and 15, 1987 on your inser-vice testing (IST) program at the Fort Calhoun Station, minutes of the meetings were sent to you dated November 16, 1987.

As was indicated by the minutes of the meeting, these discussions resulted in three open items for the NRC to address and fourteen open items for you to aedress.

The following addresses the NRC three open items aad our position on them.

The numbers are delineated according to the minutes of the teeting.

Secti No.

G 7

You stated that no credit is taken for the operability of the charging pueos in any accident scenario.

However, your Technical Specification Section 2.2(2) defines the operability of at least two charging purps as a condition necessary to assure safe reactor operation.

Moreover, Section 6.2 of the USAR states that "SIAS aligns the charging pumps in the chemical and volume control system ',o take suction from the concentrated boric acid storage tanks".

A similar statement on the actuation of these pumps following a SIAS is made in USAR Section 9.2.3.7.

It appears that tne charging pumps have a safety related function and, therefore, the charging pumps and the valves in the applicable flow paths should be included in the !$T program and tasted to the Code requirements to the extent practi, cal.

H 11 With regard to valves $1-175 and 51-176, you stated that the contain-ment spray system is redundant to the containment air filtration and cooling system and, therefore, need not be exercised.

A staff review of USAR Section 6.4.5, however, indicates that both the sprays and the containment coolers are needed for sufficient containment cooling capacity in the event of a design basis accident involving LOSP and failure of one emergency diesel. Accordingly, the staff's position is that these valves should be exercised.

3

B 2-L 1

The NRC position is that the pressurizer power operated relief val <es (PORVs) should be included in the iST program as Category B valves and tested to the requirements of Section XI.

However, si>ce the PORVs have shown a high probability of sticking open and are not needed for overpressure protection during power operation, the NRC has concluded that the IW-3410 provisions for exercising our.terly during power operation is "not practical" and, therefore, not required by 10 CFR 50.55a(g).

The PORVs' function during reactor startup and shutdown is to protect the reactor vessel and coolant system from low-temperature over-pressurization conditions and should be exercised prior to init,iation of system conditions for which vessel protection is needed.

Exercising of the PORVs should be performed after the operability of the block valves is assured by exercising and stroke timing.

The following test schedule is required:

a.

Full stroke exercising should be performed at each cold shutdown or, as a minimum, once each refueling cycle.

b.

Stroke timing should be performed at each cold shutdown, or as a minimum, once each refueling cycle.

c.

Fail-safe actuation testing should be performed at each cold shutdown.

d.

The PORV block valves should be included in the IST pecgra*

and testec Quarterly to provide protertion against a 5 all break LOCA should a PORV fail open, e.

In case of frequent cold shutd6=ns, testing of the FOR.'s is not required more often then each three months.

The above clarifications should be included in your Fort Calhoun Station IST resubmittal.

If you have any questions regarding this matter please contact me at (301) 492 7591.

The reporting and/or recordkeeping requirements contained in this letter affect fe=er than ten respondents; therefore, CMB clearance is not

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required under P.L.96-511.

Sincerely, IJ l l Anthony Bournia, Project Manager Division of Reactor Projects - Ill

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IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next page DISTRIBUTION Docket File PD4 Reading P. Noenan E. Jordan NRC PDR CR4A/ Collins ProjectManager J. Partlow Local PDR J A alvo OGC-Bethesda ARCS (10)

PD4 Plant File

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.s Mr. R. L. Andrews Fort Calhoun Station Omaha Public Power District Unit No. 1 Cc:

Harry H. Voigt Esq.

LeBoeuf Lamb, Leiby & MacRae 1333 New Hampshire Avenue, NW 1

Washington, D.C.

20036 Mr. Jack Jensen, Chairman Washington County Board of Supervisors Blair, Nebraska 68008 Mr. Phillip Harrell, Resident Inspector U.S. Nuclear Regulatory Commission P. O. Box 309 Fort Calhoun, Nebraska 68023 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations C-E Power Systems 7910 Woodmont Avenue Bethesda, Maryland 20814 Re;'onal Ad?inistrator, Region IV U.S. Nuclear Regulatory Commission O'fice of Executise Director for Operations 611 Ryan Plaza Dri,e, Suite 1000 Arlington, Texas 76011 Harold Borchert, Director Division of Radiological Health Department of Health 301 Centennial Mall, South P.O. Box 95007 i

Lin:oin, Nebraska 68509 W. G. Gates, Manager Fort Calhoun Station P. O. Box 399 Fort Calhoun, Nebraska 68023