ML20033C673
| ML20033C673 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 11/13/1981 |
| From: | Kintner L Office of Nuclear Reactor Regulation |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8112030628 | |
| Download: ML20033C673 (7) | |
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- 0V 131981 Docket No.: 50-341 4
MEMORANDUM FOR;
- 8. J. Youngblood, Chief, Licensing Branch No.1, DL FROM:
L. L. Kintner, Project Manager, Licensing Branch No.1, DL
SUBJECT:
FORTHCOMING MEETING WITH DETROIT EDIS0N COMPANY REGARDING FEWil 2 OL REVIEW DATE AND TIME:
December 2. 1981 9:00 am LOCATION:
rermi 2 Plant lionroe County, Michigan Pbh00SE:
Audit documentation showing operability of purge valves and view installation.
(Seeattachedagenda)
PARTICIPANTS:
NRC Staff M. Haughey. T. Restivo Detroit Edison Company J. Green, J. Honkala, A. Lin, W. Buchanan,
- 8. Zaninni (Jamesbury - Vendor)
Original Signed By:
LcGlor L. Kintner L. L. Kintner, Project Manager Licensing Branch No. 1 Division of Licensing cc: See next page 8112030628 8111 1
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.s unc ronw aie no,noi nncu ono OFFICIAL RECORD COPY-
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EMr. Harry Taubgr Vice President 1
-Engineering & Construction Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 cc:. Eugene B.-Thomas. Jr., Esq.
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LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N. W.
Washington, D. C.
20036-Peter A. Marquardt, Esq.
Co-Counsel The Detroit Edison Company 3
2000 Second. Avenue :
Detroit, Michigan 48226 Mr. William J. Farner-
~ Project Manager - Fermi 2
.The Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 Mr. Larry E. Schuerman Detroit Edison Company
'331 West Big Beaver Road
.roy, Michigan 48084 David E. Howell, Esq.
3229 Woodward Avenue Berkley, Michigan 48072 1
Mr. Bruce Little U. S. Nuclear Regulatory Cnmmission i
Resident Inspector's Office l
6450 W. Dixie Highway Newport, Michigan 48166 Dr. Wayne Jens Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 l
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- . L ENCLOSURE FERMI-2_
PURGE AND VENT VALVE AUDIT AGENDA One NRC reviewer and one consulttnt will travel to the Fermi-2 site to review documentation of the operability demonstration and the installations of
. purge and vent valves and the associated equipment. The major concern of~the review is whether the containment isolation valves in the purge and vent systems have the capability to close against the dynamic conditionslof a postulated design basis accident condition upon receipt of an isolation signal.
Considerations to
' be addressed in assuring design adequacy during and following an accident are defined in the staff's " Guidelines for Demonstration-of Operability 6f Purge
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and Vent Valves" (Attached)
Areas of review to be covered during the audit include the following:
1), purge and vent valve installations, orientation, and proximity to elbows (includes a walk-down to inspect installations); installation effects on aerodynamics should be considered in test / analysis, if actual installation e Tfects on aerodynamics are deferred in favor of a more conservative installation, demonstration that the method used was more conservative should be provided.
- 2) method of determining torque coefficients: test reports and proced6res and/or analysis as appropriate; justification should be provided for any deviations in the test or analysis from the actual valve, installation, or conditions (eg. scaling, test medium)
- 3) description of valve and operator: manufacturer, type, disc type, size, ratings, etc.
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.4) stress'anglysis: zidentification of critical elements, load combinations,
. determination of allowable limits, margins, actual stress vs. allowables~.
- 5) inservice inspection and preventative mainte' nance considerations
- 6) operator torque curves
- valve torque curves 9
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4-l GUIDELINES FOR DEMONSTRATION 0F OPERABILITY OF PURGE AND VENT VALVES OPERABILITY In order to establish operability it must be shown that the valve actuator's i
torque capability has sufficient margin to overcome or resist the torques and/or fcrces (i.e., fluid dynamic, bearing,. seating, friction) that resist closure when stroking from the initial open position to full. seated (bubble tigh )
e in the time limit specified. This should be predicted on the pressure (s established in the containment following a design. basis LOCA. Considerations which should be addressed in assuring valve design adequacy include:
'l.
Valve closure rate versus time - i.e., constant rate or other.
2.
Flow direction through valve; AP acrhss valve.
_. 3.
Singlevalveclosure(insidecontainmentoroutsidecontainmentvalve) or simultaneous ~ closure. Establish worst case.
4.
Containment back pressure effect on closing torque margins of air operated valve which vent pilot air inside containment.
5.
Adequacy of accumulator (when used) sizing and initial charge for. valve closure requirements.
- 6. 'For valve operators using. torque limiting devices - are the settings of the devices compatible with the torques required to operate the valve during the design basis condition.
l 7.
The effect of the piping system (turns, branches) upstream and downstream
- of all valve installations.
8.
The effect of butterfly valve disc and shaft orientation to the fluid '
mixture egressing from the' containment.
DEMONSTRATION Demonstration of the various aspects of operability of purge and vent valves may be by analysis, bench testing, insitu testing or a combination of these means.-
Purge and vent valve structural elements (valve / actuator, assembly) must be evaluated to have sufficient stress margins to withstand loads imposed while valve closes during a design basis accident. Torsional shear, shear, bending..
I tension and compression loads / stresses should be considered. Seismic loading l
should be addressed.
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Once valve closure and structural integrity are assured by analysis, testing cr a suitable combination, a determination of the sealing integrity after closure and long term exposure to the containment environment.should be i-l evaluated. Emphasis should be' directed at the effect of radiation and of the containment spray chemical solutions on seal material. Other aspects such
!as the effect on sealing from outside ambient temperatures and debris should be. considered.
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The following considerations apply when testing is chosen as a means for
'l demonstrating valve operability:
Bench testing can be used to demonstrate suitability of the in-service valve by reason of its traceability in design to a test valve. The following factors should be considered when qualifying valves through bench testing.
1.
Whether a valve was qualified by testing of an identical valve assembly or by extrapolation of data from a similarly designed valve.
2.
Whether measures were taken to assure that piping upstream and down-stream and valve' orientation are simulated.
3.
Whether the following load an'd environmental factors were considdred a.
Simulation of LOCA b.
Seismic loading c.
Temperature soak d.
Radiation exposure e.
Chemical exposure d.
Debris B.
Bench testing of installed valves te demonstrate the suitability of the specific valve to perform its required function during the postulated design basis accident is acceptable.
1.
The factors listed in items A.2 and A.3 should be considered when taking 4
~this approach.
In-Situ Testing i
in-situ testing of purge and vent valves may be performed to confirm the suitability of the valve under actual conditions. When performing such tests, the conditions (loading, environment) to which the valve (s) will be subjected during the test should simulate the design basis accident.
NOTE: Post test valve examination should be performed to establi,sh structural integrity of the key valve / actuator components.
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MEE_TINGNOTICEDISTRIBU_11M J. Stolz g5iF.ketiF,t}e?
S. Hanauer NRC"PDR' P. Collins Local PDP.
I 3 1981 D. Vassallo TIC D. Ziemann
~NSIC T. Murley TERA-Branch File F. Schroeder
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K. Kniel T. f M 4 E. Case D. Skovholt g
<f D. Eisenhut' G. Knighton 6" JL;1 W
' R. Purple M. Ernst L
NOV2 01981*g T. Novak R. Baer E. Adensam us.wya.7 S. Varga T. I'ppolito A. Thadani 9
E R. A. Cler':
N. Hughe)
ACRS (16)
Attorney, OELD 4
LA R. Tedesco OIE-(3)
J. Youngblood OSD (7)
A. Schwencer.
F. Miraglia Project Manager L. Kintnar-Licensing Assistant M. Rushbrook J. 'l. Miller Receptionist G. Lainas D. Crutchfield W. Russell-J. LeDoux, I&E J. Olshinki R. Vollmer I&E Headquarters R. Bosnak I&E Region I F. Schauer I&E Region II R. E. Jackson I&E Region III G. Lear I&E Region IV W. Johnston I&E Region V S. Pawlicki NRC
Participants:
V. Benaroya Z. Rosztoczy M. Haughey, T. Restivo W. Haass D. Muller R. Ballard W. Regan V.-Moore D. Ross P. Check O.' Parr bec: Applicant & Service List F. Rosa W. Butler W. Kreger.
R. W. Houston F. Congel W.- Gamill L. Rubenstein T. Speis; M.~ Srinivasan B. Grimt s S. Schwartz 7
F. Pagano S.'Ramos s.
J.~ ~ Kramer
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