ML20246M174: Difference between revisions

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==SUBJECT:==
==SUBJECT:==
ADDENDUMTOSAFETYEVAL0ATIONSUFPORTINGAMENDMENTN0.92TO FACILITY OPERATING LICENSE (TAC'NO. 63083)
ADDENDUMTOSAFETYEVAL0ATIONSUFPORTINGAMENDMENTN0.92TO FACILITY OPERATING LICENSE (TAC'NO. 63083)
In a letter dated November 29, 1988, you requested the NRC to revise the Safety Evaluation (SE)-issued in support of the above amendment. The amendment was issued December 7, 1987. It revised the Rancho Seco Technical Specifications (TS) to extend the definition of " refueling interval" as.it applies to the reactor vessel vent valve (RVVV) inspection interval. As defined by TS, the refueling interval is 18 months.. Amendment 92 extended the inspection interval for the RVVV inspection to the next normally scheduled refueling outage without regard to the time constraints included in the TS definition. The SE for Amendment 92 concluded that the extended inspection interval was.acceptbble; however, it also specified that the RVVV inspection-would be performed no.later than May 1989.
In a {{letter dated|date=November 29, 1988|text=letter dated November 29, 1988}}, you requested the NRC to revise the Safety Evaluation (SE)-issued in support of the above amendment. The amendment was issued December 7, 1987. It revised the Rancho Seco Technical Specifications (TS) to extend the definition of " refueling interval" as.it applies to the reactor vessel vent valve (RVVV) inspection interval. As defined by TS, the refueling interval is 18 months.. Amendment 92 extended the inspection interval for the RVVV inspection to the next normally scheduled refueling outage without regard to the time constraints included in the TS definition. The SE for Amendment 92 concluded that the extended inspection interval was.acceptbble; however, it also specified that the RVVV inspection-would be performed no.later than May 1989.
The SE supporting Amenoment 92. projected that the worst corrosion buildup, that would occur between the extended inspection periods, would not inhibit RVVV s                                                    operation. At the time the SE was written, it was expected that the Rancho Seco reactor would be refueled by May 1989. The evaluation was performed for a finite time period, 49 months, the expected time between refuelings. RVVV surveillance over the past 16 years in Dabcock and Wilcox reactors have never identified inoperable vent valves; however, most of the surveillance were performed at less than two year time intervals. At Three Mile Island, Unit 1 L(TMI-1), the reactor head was not removed during an extended shutdown period between 1982 and 1986. The TMI-1 RVVVs were tested in April 1982 and December 1986 which equates to a 56 month interval. The test results at TMI-1 were satisfactory. This provides some additional assurance that the Rancho Seco RVVVs would operate satisfactorily during a 55 month interval. Therefore, approval to extend the refueling interval as it applies to the RVVV is granted, and all
The SE supporting Amenoment 92. projected that the worst corrosion buildup, that would occur between the extended inspection periods, would not inhibit RVVV s                                                    operation. At the time the SE was written, it was expected that the Rancho Seco reactor would be refueled by May 1989. The evaluation was performed for a finite time period, 49 months, the expected time between refuelings. RVVV surveillance over the past 16 years in Dabcock and Wilcox reactors have never identified inoperable vent valves; however, most of the surveillance were performed at less than two year time intervals. At Three Mile Island, Unit 1 L(TMI-1), the reactor head was not removed during an extended shutdown period between 1982 and 1986. The TMI-1 RVVVs were tested in April 1982 and December 1986 which equates to a 56 month interval. The test results at TMI-1 were satisfactory. This provides some additional assurance that the Rancho Seco RVVVs would operate satisfactorily during a 55 month interval. Therefore, approval to extend the refueling interval as it applies to the RVVV is granted, and all
                                                                                                                                         'f 0f4          i gq*JkfMaf P
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ADDENDUtiTOSAFETYEVALUATIONSUPPORTINGAMENbMENTNO.92 TOFACILITYOPERATINGLICENSE(TACN0.63083)
ADDENDUtiTOSAFETYEVALUATIONSUPPORTINGAMENbMENTNO.92 TOFACILITYOPERATINGLICENSE(TACN0.63083)
                                                                       /
                                                                       /
             .In a letter dated November 29, 1988, you requested the NRC to revise the Safety Evaluation (SE) issued in support of the above (mendment. The amendment was issued December 7, 1987. It revised the Rancho Seco Technical Specifications (TS) to extend the definition of " refueling in'terval" as it applies to the reactorvesselventvalve(RVVV)inspectionfinterval. As defined by TS, the refueling interval is 18 months. Amendment 92 extended the inspection interval for the RVVV inspection to the next normally scheduled refueling outage without regard to the t %e constraints included n the TS definition. The SE for
             .In a {{letter dated|date=November 29, 1988|text=letter dated November 29, 1988}}, you requested the NRC to revise the Safety Evaluation (SE) issued in support of the above (mendment. The amendment was issued December 7, 1987. It revised the Rancho Seco Technical Specifications (TS) to extend the definition of " refueling in'terval" as it applies to the reactorvesselventvalve(RVVV)inspectionfinterval. As defined by TS, the refueling interval is 18 months. Amendment 92 extended the inspection interval for the RVVV inspection to the next normally scheduled refueling outage without regard to the t %e constraints included n the TS definition. The SE for
           -Amendment 92 concluded that the extende inspection interval was acceptable; however, it also specified that the RV          inspection would be performed no later than May 1989.
           -Amendment 92 concluded that the extende inspection interval was acceptable; however, it also specified that the RV          inspection would be performed no later than May 1989.
The SE supporting Amendment 92 proje ted that the worst corrosion buildup, that would occur between the extendpd inspection periods, would not inhibit RVVV operation. Additionally,RVVysurveillancesoverthepast16yearsin Babcock and Wilcox reactors have never identified inoperable vent valves. At the time the SE was written, it w/s expected that the Rancho Seco reactor would          ,
The SE supporting Amendment 92 proje ted that the worst corrosion buildup, that would occur between the extendpd inspection periods, would not inhibit RVVV operation. Additionally,RVVysurveillancesoverthepast16yearsin Babcock and Wilcox reactors have never identified inoperable vent valves. At the time the SE was written, it w/s expected that the Rancho Seco reactor would          ,

Revision as of 23:46, 8 March 2021

Submits Addendum to Safety Evaluation Supporting Amend 92 to License DPR-54,per Util 881129 Request to Revise Safety Evaluation.Approval to Extend Refueling Interval as Applies to Reactor Vessel Vent Valve Granted
ML20246M174
Person / Time
Site: Rancho Seco
Issue date: 05/08/1989
From: Knighton G
Office of Nuclear Reactor Regulation
To: Firlit J
SACRAMENTO MUNICIPAL UTILITY DISTRICT
References
TAC-63083, NUDOCS 8905190061
Download: ML20246M174 (6)
v • d • e


Text

- _ - _ _ - _ - _ _

., .[ 6 - UNITED STATES

'*o 6i$[ ' i j

NUCLEAR REGULATORY COMMISSION.

WASHINGTON, D. C, 20655

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.May 8, 1989 DicketNo.: '50-312-L Mr. Joe Fir 11t Chief Executive.0fficer, Nuclear Rancho'Seco Nuclear Station 14440 Twin Cities Road .

Herald,. California. 95638-9799

Dear Mr. Firlit:

l

SUBJECT:

ADDENDUMTOSAFETYEVAL0ATIONSUFPORTINGAMENDMENTN0.92TO FACILITY OPERATING LICENSE (TAC'NO. 63083)

In a letter dated November 29, 1988, you requested the NRC to revise the Safety Evaluation (SE)-issued in support of the above amendment. The amendment was issued December 7, 1987. It revised the Rancho Seco Technical Specifications (TS) to extend the definition of " refueling interval" as.it applies to the reactor vessel vent valve (RVVV) inspection interval. As defined by TS, the refueling interval is 18 months.. Amendment 92 extended the inspection interval for the RVVV inspection to the next normally scheduled refueling outage without regard to the time constraints included in the TS definition. The SE for Amendment 92 concluded that the extended inspection interval was.acceptbble; however, it also specified that the RVVV inspection-would be performed no.later than May 1989.

The SE supporting Amenoment 92. projected that the worst corrosion buildup, that would occur between the extended inspection periods, would not inhibit RVVV s operation. At the time the SE was written, it was expected that the Rancho Seco reactor would be refueled by May 1989. The evaluation was performed for a finite time period, 49 months, the expected time between refuelings. RVVV surveillance over the past 16 years in Dabcock and Wilcox reactors have never identified inoperable vent valves; however, most of the surveillance were performed at less than two year time intervals. At Three Mile Island, Unit 1 L(TMI-1), the reactor head was not removed during an extended shutdown period between 1982 and 1986. The TMI-1 RVVVs were tested in April 1982 and December 1986 which equates to a 56 month interval. The test results at TMI-1 were satisfactory. This provides some additional assurance that the Rancho Seco RVVVs would operate satisfactorily during a 55 month interval. Therefore, approval to extend the refueling interval as it applies to the RVVV is granted, and all

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_ - _ _ - _ _ _ _ _ _ _ _ - _ _ _ _ _ . _ _ _ - _ _ _ . _ _ _ _ _ - . A

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. Mr.* Joe Firlit May 8, 1989 for this time period. However, if the next Rancho Seco refueling is delayed beyond November 1989, the staff will reevaluate this issue and may require that one of the valves be assumed. inoperable (fails to open) in the limiting LOCA analysis for the plant.

Sincerely,

'Geor W. Knighta Director Proj t Directorate V

. Division of Reactor Projects - III, IV, V and Special Projects. .

Office'of Nuclear Reactor Regulation cc: See next page

. Mr. Joe Firlit Rancho Seco Nuclear Generating Station l ..

cc:

Mr. David S. Kaplan, Secretary Mr. John Bartus and General Counsel Ms. JoAnne Scott Sacramento Municipal Utility District Federal Energy Regulatory Commission 6201 S Street 825 North Capitol Street, N. E.

P.O. Box 15830 Washington, D.C. 20425

Sacramento, California 95813 Thomas A. Baxter, Esq. Ms. Helen Hubbard Shaw, Pittman, Potts & Trowbridge P. O. Box 63 2300 N Street, N.W. Sunol, California 94586 Washington, D.C. 20037 l, Mr. Steven Crunk l Manager, Nuclear Licensing Sacramento !!anicipal Utility District Rancho Seco Nuclear Generating Station 14440 Twin Cities Road Herald, California 95638-9799 Mr. Robert B. Borsum, Licensing Representative Babcock & Wilcox l Nuclear Power Division  !

1700 Rockville Pike - Suite 525 Rockville, Maryland 20852 Resident Inspector / Rancho Seco c/o U. S. N. R. C.

14440 Twin Cities Road Herald, California 95638 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Paul Szalinski, Chief Radiological Health Branch State Department of Health Services 714 P Street, Office Building #8 Sacramento, CalfM nia 95814 Sacramento County Board cf Supervisors 700 H Street, Suite 2450 Sacramento, California 95814

1. . - Mr. " Joe Firlit -2 flay 8,1989

.for this time period. However, if the next Rancho Seco refueling is delayed

'beyond November 1989, the staff will reevaluate this issue and may require that one of the valves be assumed inoperable (fails to open) in the limiting LOCA analysis for the plant.

Sincerely, original signed by George W. Knighton, Director Project Directorate V Division of Reactor Projects - III, IV, Y and Special Projects Office of Nuclear Reactor Regulation cc: See next page

@jDISTR;;BJTION.Docte w 11e M 7 NRC & LPDRs 4 PDS Reading-MVirgilio  !

JLee OGC(F/ info)

DHagan

'EJordan BGrimes-TMeek (4)

WJones EButcher i ACRS(10)

'GPA/PA ARM /LFMB RegionV(4)

TMarsh SReynolds SJuergens Nu pg DR GK PD5 n

h NR EMEBh D /

GK d hton SReynolds TMary/89 9 5/ /89 5/ /89 5/V 5/T/89 hJ V eb b

f Mr.* Joe Firlit

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E period. However, if the next Rancho Seco refueling is delayed beyond November 1989, the staff will reevaluate this issue and may require that one of the valves be assumed inoperable (fails to open) in the limiting LOCA analysis for the plant.- ,

Sin',arely ,

l

.I i

George W. Knighton, Director Project Directorate V )

Division of Reactor Projects - III, a IV, V and Special Projects Office of Nuclear Reactor Regulation cc: See next page '

1 DISTRIBUTION I Docket File NRC & LPDRs i PDS. Reading MVirgilio JLee OGC(F/ info)

DHagan

- EJordan /

BGrimes THeek (4)

WJones EButcher ACRS'(10)-

GPA/PA ARM /LFMB Region V (4)

TMarsh SReynolds SJuergens

-DRSP/PD5 DRSP/PD5 DRSP/PDS NRR/EMEB DRSP/D:PD5 JLee GKalman SReynolds TMarsh GKnighton 5/ /89 5/ /89 5/ /89 5/ /89 5/ /89

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= _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . - _

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l. ..; Docket No.: 50-312 DISTRIBUTION-Docket File EButcher T NRC & LPDRs ACRS(10).

PD5 Reading GPA/PA  ;

MVirgilio ARM /LFMB JLee RegionV.(4)

' Mr. Joe Firlit OGC(f/ info) TMarsh

' Chief Executive Officer, Nuclear DHagan. SReynolds Rancho Seco Nuclear Station EJordan SJuergens 14440 Twin Cities Road -BGrimes ,

. Herald, California 95638-9799 TMeek (4)

Wanda Jones

Dear Mr. Firlit:

SUBJECT:

ADDENDUtiTOSAFETYEVALUATIONSUPPORTINGAMENbMENTNO.92 TOFACILITYOPERATINGLICENSE(TACN0.63083)

/

.In a letter dated November 29, 1988, you requested the NRC to revise the Safety Evaluation (SE) issued in support of the above (mendment. The amendment was issued December 7, 1987. It revised the Rancho Seco Technical Specifications (TS) to extend the definition of " refueling in'terval" as it applies to the reactorvesselventvalve(RVVV)inspectionfinterval. As defined by TS, the refueling interval is 18 months. Amendment 92 extended the inspection interval for the RVVV inspection to the next normally scheduled refueling outage without regard to the t %e constraints included n the TS definition. The SE for

-Amendment 92 concluded that the extende inspection interval was acceptable; however, it also specified that the RV inspection would be performed no later than May 1989.

The SE supporting Amendment 92 proje ted that the worst corrosion buildup, that would occur between the extendpd inspection periods, would not inhibit RVVV operation. Additionally,RVVysurveillancesoverthepast16yearsin Babcock and Wilcox reactors have never identified inoperable vent valves. At the time the SE was written, it w/s expected that the Rancho Seco reactor would ,

be refueled by May.1989. The ev iuation was performed for a finite time l period, 49 months, the expected ime between refuelings. There is considerable ]

safety margin in the evaluation nd our conclusion, that corrosion would not ]

inhibit valve operation, is sti 1 valid if the period between inspections is j lengthened by 6 months (55 mon total). Therefore, approval to extend the )

refuelingintervalasitapplifstotheRVVVisgranted. However, if the next ]'

Rancho Seco refueling is delaydd beyond November 1989, we will reevaluate this issue.

Sincerely, i George W. Knighton, Director Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc: See next pag i

P/PD5 D3 D5 DR '5 NRR/EMEB DRSP/D:PD5 GKalman:dr S olds TMarsh GWKnighton L4/(/89 44L/89 4/11/89 4/ /89 4/ /89

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