ML16340A401

Requests Addl Info Re Valve Closure Analysis & Design of Debris Screen Strength to Complete OL Review

ML16340A401
Person / Time
Site:	Diablo Canyon
Issue date:	03/14/1979
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Morrissey J PACIFIC GAS & ELECTRIC CO.
References
NUDOCS 7904060417
Download: ML16340A401 (10)

Text

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Distribution:

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R. Hartfield

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197, WR gl File ELD R. S.

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Ross Docket Hos:

50-275 D. B. Vassallo bcc:

J.

R. Buchanan, N$ IC and 50-323 F. J. Williams T. B. Abernathy, TIC J.

F. Stolz ACRS (16)

D.

P,. Allison Hr. John C. Norrissey B. C. BuckRy Vice President 4 General Counsel E.

G. Hylton Pacific Gas 5 Electric Company R. J. Mattson 77 Geale Street S.

H. Hanauer

'an Francisco,"California 94106 J-P-Night R. L. Tedesco

Dear Nr. ttorrissey:

R.

C.

DeYoung V. A. Moore, SUBJECT-.

REtlUEST FOR ADDITIONAL INFORMATION - CONTAINMENT PURGIWG We have reviev<ed the information provided in your letter of September 11, 1978 regarding operability of the 48 inch containment purge isolation valves.

In order to comp]ete our review we vill need the information described in the enclosure regarding the valve c1osure analysis.

In

addition,

>",e wi11 need design.information regarding the strength of the debris screen, which we have discussed with your personnel.

This matter would not preclude completing our review of your operating

.license application since the valves can be kept closed pending a finding on their ope'rability.

However,. we have discussed the required information with your personnel and we understand that it will be submitted imaediately after receipt of this letter.

Please contact us ifyou have any questions about this matter.

Enclosure:

Requests for Additional Information

'incerely, Origirual signed by SohnP. Stolz John F. Stolz,=Chief Light Mater Reactors Branch No.

1 Division of Project Management CC'ee next page

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Hr. John C. Morrissey cc:

Hr. John Marrs Managing Editor San Luis Obispo County Telegram - Tribune 1321 Johnson Avenue P. 0. Box 112 San Luis Obispo, California 93406 Philip A. Crane, Jr.,

Esq.

Pacific Gas

& Electric Company 77 Beale Street San Francisco, California 94106 Janice E. Kerr, Esq.

California Public Utilities Coomission 350 McAllister Street San Francisco, California 94102 Hr. Frederick Eissler, President Scenic Shoreline Preservation Conference, Inc.

4623 More Mesa Drive Santa Barbara, California 93105 Hs. Elizabeth E. Apfelberg 1415 Cazadero San Luis Obispo, California 93401 Ms. Sandra A. Sil ver 1792 Conejo Avenue San Luis Obispo, California 93401 Hr. Gordon A. Silver 1792 Conejo Avenue San Luis Obispo, California 93401 Paul C. Valentine, Esq.

321 Lytton Avenue Palo Alto, California 94302 Yale I. Jones, Esq.

19th Floor 100 Van Ness Avenue San Francisco, California 94102 Alan S. Rosenthal, Esq.

Atomic Safety

& Licensing Appeal Board U. S. Nuclear Regulatory Coranission Washington, D. C.

20555 Elizabeth S. Bowers, Esq.,

Chairman Atomic Safety

& Licensing Board U. S. Nuclear Regulatory Commission Washington, O. C.

20555 Mr. Glenn 0. Bright Atomic Safety

& Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Tolbert Young P. 0. Box 219 Avila Beach, California 93424 Richard S. Salzman, Esq.,

Chairman Atomic Safety

& Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Or.

W. Reed Johnson Atomic Safety

& Licensing Appeal Board U. S. Nuclear Regu'iatory Commission Washington, D. C.

20555 Mr. Richard Hubbard MHB Technical Associates 366 Ca'lifornia Avenue Palo Alto, California 94306

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Mr. John C. Morrissey cc:

Hs. Raye Fleming 1'746 Chorro Street San Luis Obispo, California 93401 Brent Rushforth, Esq.

Center for Law in the Public Interest 10203 Santa Monica Boulevard Los Angeles, California 90067 Arthur C. Gehr, Esq.

Snell 8

Wi lmer 3100 Valley Center Phoenix, Arizona 85073 Hr. James

0. Schuyler, Project Engineer Pacific Gas 5 Electric Company 77 Beale Street San Francisco, California 94106 Bruce Nor'ton, Esq.

3216 North 3rd Street Suite 202 Phoenix, Arizona 85012 Hr.

W. C. Gangloff

.Westinghouse Electric Corporation P. 0.

Box 355 Pittsburgh, Pennsylvania 15230 Hichael R. Klein, Esq.

Wilmer, Cutler 8 Pickering 1666 K Street, N.

W.

Washington, D. C.

20006 Da vid F.

F 1 ei sch aker, E sq.

1025 15th Street, N.

W.

5th Floor Washington, D. C.

20005 Dr. William E. Hartin Senior Ecologist Battelle Memorial Institute

Columbus, Ohio 43201

MECHANICAL ENGINEERING BRANCH RE(UEST FOR ADDITIONAL INFORMATION DIABLO CANYON UNITS 1

5 2 CONTAINHENT PURGE VALVES l.

An error message is printed only if the difference between the predicted and calculated valve positions exceeds 0.2 degrees.

Justify the use of this error limit and indicate how the analysis results would vary if a smaller value were used.

2.

The analysis assumes a perfect relief valve (i.e.,

one capable of maintaining the cylinder pressure exactly at 45 psig) on the cylinder.

Justify the use of such a model and indicate how the analysis results would vary if a more realistic relief valve model were used.

3.

Indicate how the actuator pressure is calculated when the so'lenoid valve is open.

4.

Expand your discription of the use of the hysteresis curve to specifically indicate:

a.

The source of the entering arguments; and b.

The use of the output value.

Of particular concern is the case when the cylinder pressure and valve position do not agree with the values shown on the hysteresis curve.

5.

Indicate how the hysteresis curve was developed (i.e., Is it based on spring closure or aerodynamic closure of the valve?

Is it based on back pressure in the cylinders')

Justify any deviations from

f r'

4.

g ~ the conditions which exist at the time of post-LOCA valve closure.

6.. Indicate how linkage flexibilities and slippages are accounted for 1

in the analysis.

7.

The calculated valve position is based on final torques and accelerations.

Justify the use of such a method and indicate how the analysis results would vary if another

method, such as the use of average

values, were used.

8.

Demonstrate that the valve will, in fact, oscillate through the zero position and not just open backward and remain there.

9.

Demonstrate that the effects of the valve oscillation through the zero position will not adversely affect the ability of the valve to stop flow.

10.

At approximately 1 second into closure the shaft (opening) torque exceeds the aerodynamic (closing) torque and yet the valve continues closing at a constant rate.

.Justify this error and indicate'ow the analysis results would vary if this err or were not present.

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