ML20236S613
| ML20236S613 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/24/1987 |
| From: | Anand R Office of Nuclear Reactor Regulation |
| To: | Jocelyn Craig Office of Nuclear Reactor Regulation |
| References | |
| TAC-64323, NUDOCS 8711250281 | |
| Download: ML20236S613 (5) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION y
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.... 4 Docket No. 50-341 NOTE T0: John W. Craig, Branch Chief Plant Systems Branch Division of Engineering and System Technology THRU:
Jack Kudrick, bection Leader Plant Systems Branch Division of Engineering and System Technology FROM:
Raj k. Anand Plant Systems Branch Division of Engineering and System Technology
SUBJECT:
TELECON (JULY 14, 1987, 2:00PM) WITH DETROIT EDISON CONCERNING FERMI-2 THEPy.AL HYDROGEN RECOMBINER SURVEILLANCE (BLOWER SHAFT SEAL) - TAC 64323 A conference call was held between the Detroit Edison (Steve Frost etc.) and staff (J. Kudrick, R. Anand an6 J. Stefano) on July 14, 1987 concerning adequacy of Fermi-2 Themal Hydrogen Recombiners Surveillance requirements for the blower shaft seal. The licensee submitted a LER 86-047-01 dated February 9,1987 regarding a failure of the Division II Thermal Hydrogen Recombiner System. The licensee was performing a Technical Specification (TS) required 6-month functional surveillance on the Division II hydrogen recombiner system.
The test was being performed using the Keep-Fill (Demineralized water) system as a source of cooling water for thermal recombiner system.
During the test, the licensee initiated the RHR system in the torus cool %g mode in preparation for HPCI testing. When the RHR system was started, the air temperature of the thermal recombiner began decreasing. This prevented successful completion of the thermal recombiner surveillance.
T.S. 4.6.6.1 states; "At least once per 6-months by verifying during a recombiner system functional test that the heater outlet gas tempera-ture increases to greater than or equal to 1150 F within 75 minutes and is maintained for at least I hour." The licensee was unable to satisfy these requirements upon initiaition of the RHP system and subsequently declared both j
divisions of thermal recombiners inoperable and took appropriate action to comply i
with T.S. 3.0.3.
The plant was in Operational Condition 2 (startup), operating i
at 917 psig, 520'F., and 4 percent reactor power.
j The licensee has determined that the inability to achieve outlet gas temperature l
was due to excessive cooling flow through the combiner pas blower shaft seal.
The cooling water flow to the thermal recombiner had been provided at 80 psig through the Keep-Fill system. When the RHR system w:s started, the pressure I
was increased to about 220 psig which resulted in greater flow and thus more l
cooling. This resulted in a decrease of the thermal recombiner temperature.
l As corrective actions, resized orifices have been installed, and surveillance I
test procedures have been revised to require recombiners functional testing be performed with the RHR pumps operating. The fact that the redesign implemented by the licensee corrected the problem, the staff expressed a desire to review the details of the redesign and requested that the licensee describe methods to conduct surveillance to ensure the continued availability of the themal l
8711250281 870724 PDR ADOCK 050 1
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, - -recombiners as the plant operates for longer periods of time. Additionally.
the staff also expressed interest with the design details to ascertain if the event at Fermi-2 could involve any generic irnplications. By letter dated April 3, 1987, the licensee provided a comprehensive information regarding the design details.
The staff expressed its concern that the surveillance testing, while acceptable as proposed, was being diluted in that e position of the test requirements would be in the technical specifications while the actual test to be perfomed would be in the licensee's surveillance test program. The concern was that this dilution of test requirements could cause confusion.
It is the staff's position that since the Femi-2 design is unique (the only other plant which requires cooling water for the hydrogen recombiner blower shaft seal is Shorehami end that hydrogen thermal recombiners are an integral part of the DBA analysis for LOCA, all of the surveillance test requirements should be included in the Fermi-2 Plant Technical Specifications. The licensee disagrees with this posiiton and believes that inclusion of such surveillance test detail in the technical speci-fication is contrary to on going efforts to delete unnecessary requirements from the Plant Technical Specifications.
k D.
D>f Raj nand Plant Systems Branch Division of Engineering and System Technology cc:
A. Thadani M. Virgilio J. Kudrick G. 'Stefano 4t PDR
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DISTRIBUTION:
RDG FILE SUBJECT FILE RANAND JKUDRICK JWERMIEL JWCRAIG O
8: DEST:
PS. DEST RAnand:dj JKudrick 7/4/87 7/ /87
RECULAtORY INFORMATION DISTRIBUTION SYSTEN (RIDS) q Aceracrew hmm. n7nomm e w myym;,y; accg7.
1,IFACIL:50-341 Enrico Fermi Atomic Power Plant, Unit 2, Detroit Edis 05000341 AUTH.NAME AUTHOR AFFILIATION BRECNI,L.P.
Detroit Edison Co.
LENART,R.S.
Detroit Edison Co.
RECIP.NAME
- RECIPIENT AFFILIATION i
- - SUDJECT: LER 86-047-01:on'861226, during' scheduled testing of~Div-II i
' thermal hydrogen recombiner, heater outlet gas did not reach required temp. Caused by vendor supplied orifices in lines to iecombiner blower.Resized orifices installed.W/870209 Itr.
DISTRIBUTION CODE: IE22D COPIES RECEIVED: LTR ENCL SI ZE:
TITLE: 50.73 Licensee Event Report (LER) x NOTES:
RECIPIENT COPIES RECIPIENT COPIES ID CODE /NAME LTTR ENCL ID CODE /NAME LTTR ENCL BWR PD3 LA 1
1 cpihrK%
1 1
ZNTER NAL: ACRS MICHELSON 1
1 ACRS NOELLER 46 1
1 ACRS WYLIE 1
1 AEOD/NAS 1
1 AEOD/PTB 1
1 AEOD/ROAB 2
2 IE/DEPER/EAB O2 1
1 IE/DI/ORPB/S1 1
1 NRR PWR-A EB 1
1 NRR PWR-A EICSB 2
2 i
NRR PWR-A FOS 1
1 NRR PWR-A PSB 1
1 S
1 NRR PWR-B ADTS 1
1 NRR PWR-B EB-1 1
NRR PWR-B FOB 1
1 NRR PWR-B PEICS 2
2 NRR PWR-B RSB 1
1 NRR/DHFT/TSCB 1
1 N9R/DSRO DIR 1
1 NRR/ORAS' 35 1
1 RON3 01 1
1 EXTER NAL: EC&G CROH,N 5
5 H ST LOBBY WARD 1
1 LPDR 04 1
1 NRC PPR 03 1
1 NSIC HARRIS,J 1
1 NSIC NAYS,C 1
1 q
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1 l
, TOTAL. NUMBER OF COPIES REQUIRED: LTTR:
45 ENCL 45
._______________-____N
TRANSMITTAL OF DIVISION OF BWR LICENSING WORK REQUEST
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SPECIAL HANDLING - PROCESS WITHOUT. DELAY
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Description of review requested:
S e<L G b cded m be-Requested target date (PM) k[2[87 Proposed target date (review br) 7.8/ 87 Basis for request.date:
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dd<L 4(3/87, ccytes o(&ded.
_ Regional Resource Determination If review would benefit from unique regional' knowledge or proximity to site, but is not being assigned for regional review, state reason:
APPROVALS NAME INITIALS DATE 1.
Project Manager bn ]. Wr>o M'
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Project Director
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Review Branch Chief
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EXb REVIEWER'S NAME RAMS INITIALS g na i
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K. Pulsipher (for log
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