ML18037A373
| ML18037A373 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/13/1982 |
| From: | Dise D NIAGARA MOHAWK POWER CORP. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8204190070 | |
| Download: ML18037A373 (4) | |
Text
REGULATORY
)FORMATION DISTRIBUTION SY M (RIDS)
ACCESSION NBR: 8204190070 DOC. DATE: 82/Ou/13 NOTARIZED: No, DOCKET 0
FACIL:50-220 Nine Mile Point Nuclear Stations Uni~t ig Niagara Powe 05000220 AUTH BYNAME AUTHOR AFFILIATION DISEUR D ~ P ~
Niagara Mohawk Power Corp.
RBCIP ~ NAME RECIPIENT AFFILIATION VA'SSALLOeD F 8'perating Reactors Branch 2
V
~
SUBJECT:
Discusses'contingency plan ~to replace recirculation nozzle safe-ends due to numerous indications<Uni}t will be shutdown for approx
- j. yr.'Schedule =encl, DISTRIBUTION 'CODE A052S COPIES RECEIVED LTR ENCL
'IZE ~.
/
/
TITLE: Natu> al Circulation Cooldown (GL ~ 81-21)
Responses-Mul tiplant Action B
NOTES:
RECIPIENT ID CODE/NAME ORB 02 BC 01 INTERNAL: ELD NRR/DHFS DEPY08 NRR/DL/ORAB NRR/DSI/RAB IL OQ
~COPIES LTTR ENCL 13 13 1
0 1
1 0
1 1
.1 REC IP IENT ID CODE/NAME IE NRR/DL, DIR NRR/DL/ORB3 NRR/DS I/RSB RGN1 06 COPIES LTTR ENCL 1
1 1
1 1
1 1
1 EXTERNAL: ACRS NRC PDR NTIS 09 02 10 10 1
1 1
1 LPDR NSIC 03 05 1
1 1
1 TOTAL NUMBER. OF COPIES REQUIRED:
LTTR 37 ENCL 35
P
, r h
I qP't 0
t h
'H A
r II t
g l I il I
I i N
ll 1
"l pI
V NIAGARA+
Q QQog+Qg NIAGARAMOHAWKPOWER CORPORATION/300 ERIE BOULEVARDWEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 April 13, 1982 Director of Nuclear Reactor Regulation Attention:
Domenic B. Vassallo, Chief Operating Reactors Branch 5'2 U.S. Nuclear Regulatory Commission Washington, D.C. 20555
~~>VPg gp~
"tug 8 ~88ga 9
@Apg~y~
egg(
7 npc.@@@
Cpp Re:
Nine Mile Point Unit 1
Docket No. 50-220 DPR-63 Gentlemen:
On March 20,
- 1982, Niagara Mohawk took Nine Mile Point Unit 1 off the line to repair unidentified leakage in the drywell.
This leakage was from reactor building closed loop cooling to the recirculation pump coolers.
Upon completion of this repair work, normal test and inspections were conducted prior to restarting the unit.
During a hydro test on March 23, 1982, water droplets were discovered on the outside of two recirculation nozzle safe ends.
Subsequent to this testing, ultrasonic examinations on both safe ends were performed and yielded numerous indications.
In addition, ultrasonic examination of another safe end was performed which resulted in another indication.
Niagara Mohawk has currently put into motion its contingency program which was developed in 1979 for replacement of these safe ends.
We anticipate that the unit will be shutdown for approximately one year to make these replacements.
A schedule is attached.
This information has been relayed to yourself and various members of your staff since discovery.
Niagara Mohawk will keep you informed as further developments take pl ace.
Very truly yours, NIAGARA MOHAWK POWER CORPORATION MGM:ja Attachment Donald P. Disc Vice President
- Engineering gl
~
k
~
~
I 9
+l gl