ML17053B157

Summary of 791015 Meeting W/Util in Bethesda,Md Re Review of Electrical & Mechanical Design of Containment Purge Valves

ML17053B157
Person / Time
Site:	Nine Mile Point
Issue date:	10/19/1979
From:	Polk P Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 7911070081
Download: ML17053B157 (8)

Text

Docket No. 50-220 OCTOBER 1 9 1979

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LICENSEE:

Niagara Iiohawk Power Corporation<.-

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SUBJECT:

OCTOBER 15, 1979'tiEETING WITH NIAGARA MOHAWK POWER CORPORATION TO REVIEW THE ELECTRICAL'ND t1ECHANICAL DESIGN OF'CONTAINMENT "

PURGE VALVES I

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A meeting was held in Bethesda'on'October 15,.1979 to discuss with representatives of t~iagara Mohawk the design-of the Nine Hile.Point (Unit 1) containment purge valves.

Enclosure (1) is the meeting agenda,

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and enclosure (2) de1ineates attendance at this meeting.

t<iagara f/ohawk purges containment to maintain required containment'P between drywell and secondary containment and between torus and secondary containment.

A second system is used for containment inerting and deinerting necessitated'dur ing refueling outages.

The pump back system is entirely located'nside the drywell.

Therefore, this system is not

.considered as part of the staff concern regarding either containment integrity or electrical bypass of a safety function as described in the NRC letter of November 29, 1978.

r'he containment inerting system is used for deinerting 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to plant shutdown.and similarly for inerting 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to plant startup.

This system is the subject of the aforementioned staff concerns for this reason as well as for the reason that Niagara tttohawk would like to retain the use of the inerting system as a backup for the pump 'back system.

(Reliability of the pump back system is'questionable from a power generation design standpoint. )

The c'ontainment inerting system is typically used approximately, 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> per year; i.e., for 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> per piant shutdown which historicaIIy has been necessary on a quarter1y basis.

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The staff.discussed the guidelines for valve operability as described in NRC letter of September 27, 1979.

This long term program for purging and venting required the licensee to inform us within 30 days re a commitment to a valve qualification on an expedited basis.

Niagara will inform us as soon as possible about their intentions.

The staff will make persopnel available to discuss the requirements of the September, letter.

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e OCTOBER i 9 i979 operation iodine. concentration vs. iodine spiking vs. TID source terms.

The licensee'committed to verify the 60 second closure and to provide a para=

metric dose anlaysis.

The stiff will provide a position regardi'ng calcu-lations which assume closure times in excess of the current 10 second maximum allowable.

The staff initiated position re post LOCA source terms is that for the time 0 to 10 seconds Technical Specifications limits apply, and from 10 to 60 seconds TID source terms apply.

In addition to accident doses, the normal dose limits at the site boundary were discussed.

The licensee agreed to provide doses calaulated using Technical Specification 1'imits and the assumed approximate 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> per year *purging rate.

The licensee indicated that samples were analyzed prior to purging, and that during purging stack monitors were used in order to detect abnormally high

'adiation levels.

The licensee agreed to review the sensitivity of these instruments relative to the 250,000 SCFth of dilution flow to the stack from other plant vent systems.

A brief electrical design review was.made.

Personnel were not.available to discuss the details and specificC.

Therefore, -the'electrical review is to be

'rescheduled in the near future.

The purge valve short term program was discussed and the staff's preliminary draft position for interim operation was verbally presented..

The licensee agreed to be responsive to. the staff position upon receipt of our formal transmittal.

Enclosures:

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Agenda 2.

Attendees

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Philip J. Polk; Project Manager Operating Reactors Branch ¹3 Division of Operating Reactors Drnca~

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 OCTOBER I 0 I979 Enclosure 1

Docket No. 50-220 MEMORANDUM FOR:

T. A. Ippolito, Chief, ORB

$/3, DOR FROM:

SUBJECT:

Time and Date:

Location:

Purpose:

Participants:

P. J. Polk, Project Manager, ORB 83, DOR FORTHCOMING MEETING WITH THE NIAGARA MOHAWK POWER CORPORATION TO REVIEW THE ELECTRICAL AND MECHANICAL DESIGN OF CONTAINMENT PURGE VALVES.

9:00 A.M., October 15, 1979 Room P-130A, Phil lips Building NRC to review the design of containment purge valves.

Included in the review will be the electrical design which covers schematic and control circuitry.

The mechanical review will consist of a discussion of the guidelines for demonstration of operability.

(See attached agenda).

NRC P. Polk, J.

T. Beard, E. Reeves, K. Wichman, L. Nichols, J. Kerrigan, E. Adensam, F. Witt, W. Pasedag, T. Ippolito Nia ara Mohawk W. DiAngelo BNL T. Restivo

Enclosure:

Agenda Philip J. Polk, Project Manager Operating Reactors Branch 83 Division of Operating Reactors

AGENDA NRC/NIAGARA MOHAWK MEETING OCTOBER 15 1979 NINE MILE POINT CONTAINMENT VENTiPURGE VALVES TIME 9:00 a.m.

9:30 a.m.

10:00 a.m.

10:15 a.m.

':00 p.01.

2:30 p.D1.

SUBJECT System Layount/Valve Arrangement (Niagara Mohawk)

Procurement Specifications/Environmental gualification (Niagara Mohawk)

Plant Purging/Venting Operat-;ng Requirements (Niagara Mohawk)

Electrical Design of Valves (Niagara Mohawk)

(1)

Control and Instrumentation Circuitry/Schematics (2)

ESF and Containment Isolation Circuitry (including bypass capability)

Valve Mechanical Operability (NRC)o (1)

Discussion of Guidelines (2)

Discussion of Information Needs Summary/Conclusion

0 Enclosure (2)

ATTENDANCE

. NRC/NIAGARA MOHAWK MEETING OCTOBER 15, 1979 NINE MILE POINT CONTAINMENT VENT/PURGE VALVES Nia ara Mohawk M. Mosier T, Perkins NRC E.

Reeves D ~ Wilson J.

T. Beard D.

Shum F. Witt J.

Zud'ans P. Polk G. Knighton *

"Attendance at afternoon session only