ML17278A503
| ML17278A503 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/06/1985 |
| From: | Adensam E Office of Nuclear Reactor Regulation |
| To: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| TAC-57279, NUDOCS 8512120467 | |
| Download: ML17278A503 (5) | |
Text
December 6,
1985 Docket No.:
50-397 Mr. G.
C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System 3000 George Washington Way P.O.
Box 968
- Richland, Washington 99352
Dear Mr. Sorensen:
DISTRIBUTION-i~kk
-Fk.
NSIC Local PDR JBradfute ACRS (16)
OELD, Attorney FCherney SMou WModges RBosnak HBrammer EHylton Service List NRC PDR PRC System BWR PD¹3 R/F JPartlow BGrimes EJordan WButler BSheron RLi DTerao BLiaw JKnight RBosnak 0 OQI Oft IV
%IV VO Oa A+
OQ Ql Ql Os QOP)
OIV tlag k
Subject:
WNP-2 Request for Fatigue Usage Limit Relaxation
Reference:
Letter from G.
C. Sorensen to A. Schwencer, "Nuclear Plant No.
2 Request for Fatigue Usage Limit Relaxation" dated January 27, 1985 To conform with Standard Review Plant 3.6.2, "Determination of Rupture Locations and Dynamic Effects Associated With the Postulated Rupture of Piping,"
a break must be postulated in any ASME Class 1 high energy piping system in which the fatigue cumulative usage factor exceeds a value of 0. l.
In the referenced letter, the Supply System requested that this usage factor limit be'relaxed from 0. 1 to 0.4 for those portions of the WNP-2 Reactor Feedwater (RFW) Piping located between the containment isolation valves.
The Supply System's basis for this request was that to preclude exceeding the
- 0. 1 limit, use of the RFW has been restricted, which places unnecessary dependence upon safety systems for maintenance of core coverage.
The Supply System further stated, however, that the 0. 1 usage factor limit may only be marginally exceeded in its ongoing RFW re-analysis.
The staff assumes that this re-analysis includes transients applicable to the 40-year lifetime of the plant.
The staff's position relative to this plant-specific request is as follows:
1.
There is no basis at this time for the staff to deviate from the Standard Review Plan 3.6.2 criteria.
Therefore, the requested increase in usage factor from
. 1 to.4 is not acceptable.
2.
The staff feels that the licensee should not operate its plant solely to avoid exceeding the
. 1 limit.
The licensee should operate its plant in the safest possible manner keeping a record of the accumu-lated usage factor at critical locations.
rt
,y nr
~ %
h
~
f I
~,l III I
A'
Mr. G. C.'SorensenI'2-3.
If, after some period of operation, the.I usage factor limit appears to be imminent at any location, the licensee should notify the staff and a decision will be made on a case by case basis whether to allow an increase in the limit. It is the staff's understanding that it will be a number of years before the
. I limit will be exceeded in the RFW.
It should be noted that ANSI/ANS-58.2, "American National Standard Design Basis for Protection of Nuclear Power Plants Against Effects of Postulated Pipe Rupture" is currently being revised to address this specific issue and that the staff is participating in this effort.
The staff anticipates that this work (iqyy3 result in a relaxation of the
. 1 limit.
If you have any questions or comments, please contact your project manager, Mr. John 0. Bradfute, (492-9779) or Elinor Adensam (492-7831).
Sincerely, cc:
See next page Eli
- Adensam, Director Project Directorate b'3 Division of BWR Licensing R
Dt L ':PD83 JBradfute:mn E
on
/2/ 4 /85
) / tp/85 D:BWR PD o%4 EAdensam
)</o&/85 EIB: DSRg 8 E'IB FCherney RBosnak (g/$ /85
/p. /i /85 C:E:
D:BWR BLiaw
<~/o+85
~5 t
I~
~
t t
h
Mr. G.
C. Sorensen, Manager Washington Public Power Supply System WPPSS Nuclear Project No.
2 (WNP-2)
CC:
Nicholas S. Reynolds, Esq.
Bishop, Liberman,
- Cook, Purcell 5 Reynolds 1200 Seventeenth
- Street, N.W.
Washington, D.C.
20036 Mr. G.
E.
- Doupe, Esquire Washington Public Power Supply System P. 0.
Box 968 3000 George Washington Way Richland, Washington 99532 Mr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Mail Stop PY-ll Olympia, Washington 98504 P. L. Powell, Licensing Manager Washington Public Power Supply System P. 0.
Box 968, MD 956B Richland, Washington 99352 Mr. W.
G.
Conn Burns and Roe, Incorporated c/o Washington Public Power Supply System P. 0.
Box 968, MD 994E Richland, Washington 99352 R. B. Glasscock, Director Licensing and Assurance Washington Public Power Supply System P. 0.
Box 968, MD 280 Richland, Washington 99352 Mr. C.
M. Powers WNP-2 Plant Manager Washington Public Power Supply System P. 0.
Box MD 927M Richland, Washington 99352 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596