ML18038B187
| ML18038B187 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/09/1995 |
| From: | Salas P TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9503140155 | |
| Download: ML18038B187 (9) | |
Text
P R.IC3R.I MY'ACCELERATED RIDS PROCESSIX REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9503140155 DOC.DATE: 95/03/09 NOTARIZED: NO DOCKET FACIL:50-259 Browns Ferry Nuclear Power Station, Unit 1, Tennessee 05000259 AUTH.NAME AUTHOR AFFILIATION SALAS,P.
Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Requests relief from ASME Section XI B&PV Code requirement to perform as-found testing prior to mod of MSRVs installed in BFN Unit 1.Request for Relief PV-36 for as-found testing of currently installed Unit 1 MSRVs encl.
DISTRIBUTION CODE:
A047D COPIES RECEIVED:LTR g ENCL g SIZE:
TITLE: OR Submittal: Inservice/Testing/Relief from ASME Code GL-89-04 NOTES:
RECIPIENT ID CODE/NAME PD2-4 WILLIAMS,J.
INTERNAL: AQRS FILE CENTE 01 RR/DE/EMEB OGC/HDS3 EXTERNAL: LITCO BROWN, B NOAC COPIES LTTR ENCL 1
3 1
1 6
6 1
1 1
1 1
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1 RECIPIENT ID CODE/NAME PD2-4-PD AEOD/SPD/RAB NRR/DE/EMCB NUDOCS-ABSTRACT RES/DSIR/EIB LITCO RANSOME,C NRC PDR COPIES LTTR ENCL 1
1 1
1 1
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1 NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE KVASTE!CONTACTTIIEDOCUMENTCONTROL DESK, ROOM Pl-37 (EXT. 504-2083 ) TO ELI4iIINATEYOUR VAXIEFRO4%, I DISTRIBUTIONLISTS I'OR DOCUiMENTS YOU DO. 4"I' v'EED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 20 ENCL 19
Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609 March 9, 1995 10 CFR 50. 55a (a) (3) (i)
U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Tennessee Valley Authority
)
Docket No. 50-259 BROWNS FERRY NUCLEAR PLANT (BFN)
UNIT 1 - AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)
SECTION XI INSERVICE TEST (IST)
PROGRAM - RELIEF REQUEST (RR) PV-36 In accordance with the provisions of 10 CFR 50.55a(a)(3)(i),
TVA requests relief from the ASME Section XI Boiler and Pressure Vessel Code requirement to perform as-found testing prior to modification of the Main Steam Relief Valves (MSRV) currently installed in Unit 1.
Unit 1 has been shutdown since 1985 and as-found testing of the MSRVs will not provide useful data.
Following planned modifications, the MSRVs will be tested and recertified prior to use as required by Technical Specifications.
TVA plans to use the valves as replacements for Units 2 and 3 and as spares for future use.
As outlined in the enclosed Request for Relief, TVA has determined that this testing will provide an acceptable level of quality and safety.
Enclosed is TVA's Request for Relief (PV-36) for as-found testing of the currently installed Unit 1 MSRVs.
TVA requests review and approval of the Request for Relief by September 1,
1995 to support modification and testing of the MSRVs prior to the next Unit 2 refueling outage that is currently scheduled for April 1996.
Approval of the Request for Relief will result in a cost savings of approximately
$27,000 based on testing costs.
'tf503140155
'sf50309 PDR ADOCK 0500025tft P
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U.S. Nuclear Regulatory Commission Page 2
March 9, 1995 There are no commitments contained in this letter.
If you have any questions, please contact me at (205) 729-2636.
incer l e
Salas anager of Site Licensing Enclosure cc (Enclosure):
Mr. Mark S. Lesser, Acting Branch Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637
- Athens, Alabama 35611 Mr. J.
F. Williams, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852
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ENCLOSURE TENNESSEE VALLEY AUTHORITY BROWS FERRY NUCLEAR PLANT (BFN)
UNIT 1 REQUEST FOR REL1EF PV-36 System:
Drawing:
Components:
Category:
Class:
Function:
Main Steam (MS)
(01) 1-47E801-1 Main Steam Relief Valves (MSRVs) PCV-01-04, 05, 19, 23, 30, 31, 41, 42, and 179 currently installed on Unit 1.
Serial numbers of the nine MSRV pilot valves affected by this Relief Request are
- 1017, 1027,
- 1060, 1064,
- 1068, 1072,
- 1075, 1078, and,1084.
Provide a relief function to prevent overpressurization of the nuclear system.
Additionally, the MSRVs (six valves) provide automatic depressurization for small breaks in the nuclear system so that the Low Pressure Core Injection mode of the Residual Heat Removal system and the Core Spray system can operate to protect the fuel barrier.
Code Requirement:
Basis for Relief:
American National Standards Institute/American Society of Mechanical Engineers (ANSI/ASME)
OM-1-1981, Section 3.3 Periodic testing of all pressure relief devices is a requirement.
No maintenance, adjustment, disassembly, or other activity that could affect as-found set pressure or seat tightness is permitted prior to testing.
Back round Each unit at BFN contains 13 MSRVs, six of which are also designated as Automatic Depressurization System (ADS) valves.
The MSRVs are Target Rock Model Number 7567F two-stage'alves.
The MSRV pilot valves on Unit 1.were installed during the Unit 1 Cycle 4
(U1C4) refueling outage in 1983.
Unit 1 was subsequently shutdown during Cycle 5 in
March 1985 and has remained in this condition since then.
Since the shutdown, four MSRV pilot valves have been removed for other use, leaving nine MSRV pilot valves currently installed on Unit 1.
Current plans are to use the Unit 1 MSRV pilot valves as replacements for Units 2 and 3 and as spares for future use.
Before the Unit 1 MSRV pilot valves can be used, planned modifications to
,address Environmental Qualification concerns are required to be performed.
Following modification, the MSRV pilot valves must then be tested for set pressure and leakage for certification prior to use.
In accordance with the requirements of ANSI/ASME OM-1-1981, Section 3.3, as-found set pressure and seat leakage testing must be performed prior to any maintenance, adjustment, disassembly, or other activity that could affect set pressure or seat, tightness.
Therefore, set pressure and leakage testing must be performed prior to the planned modifications as well as following the modifications.
Technical S ecifications TSs Surveillance Requirements for the MSRVs are listed in Unit 1 TS 4.6.D.
This TS does not require as-found testing of the MSRVs prior to modification but requires bench-checking as follows:
Approximately one-half of all relief valves shall be bench-checked or replaced with a bench-checked valve each operating cycle.
All 13 valves will have been checked or replaced upon the completion of every second cycle.
This relief request does not affect compliance with TS 4.6.D.
The nine remaining MSRVs installed on Unit 1 will be bench-checked as required by TS 4.6.D.1 prior to re-use.
Justification for Relief BFN requests a one time relief from the requirement to perform as-found testing of the nine MSRV pilot valves prior to the planned modifications.
BFN believes that as-found testing of the MSRV pilot valves after ten years of unit shutdown will not provide information more useful than the information currently available.
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Historical as-found testing of Target Rock two-stage safety relief valves by BFN and other plants has provided ample data for review. It is not expected that the data from the as-found testing could be correlated to existing data due to the long outage time (ten years) prior to testing.
Additionally, data from as-found testing of these nine MSRV pilot valves could not be accurately applied to MSRV pilot valve performance during the pre ious operating cycle.
The MSRV pilot valves will be tested for setpoint and seat leakage as required by OM-1-1981 and BFN TSs 1.0.MM
& 4.6.D.l prior to installatioh (post-modification).
The operability of the MSRV pilot valves will be confirmed by testing during startup of the unit on which the MSRV pilot valves are installed as required by TSs.
These requirements will provide an acceptable level of quality and safety.
Based on these
- reasons, there is no increased risk to the public for this Request for Relief.
This is a one time request for relief from as-found testing prior to modifications of the nine MSRVs currently installed on Unit 1.
As-found testing of the other MSRVs pilot valves at BFN is not, affected.
Alternative Testing:
The nine MSRV pilot valves removed from Unit 1 will be tested for setpoint and seat leakage following modification and prior to re-use of these valves.
This testing will ensure that the operation of these valves is in accordance with ASME and plant TS requirements.
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