ML19261F196
| ML19261F196 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/21/1974 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | |
| References | |
| GQL-0099, GQL-99, NUDOCS 7910250614 | |
| Download: ML19261F196 (4) | |
Text
AEC DI
?T3UTICN FOR PART 50 DCCXET E r TAL~
CONTROL NO:
5805 (TEMPORARY FCP.M)
FILE:
FROM:
DATE OF DCC DATE REC'D LTR TWX RP
CTHER Metropolitan Edison Company Reading, Penn. 19603 Mr. R.C. Arnold 6-21-74 6-24-74 X
TO:
ORIG CC OTHER SENT AEC PDR XXX SENT LP;AL POR XXX AEC 1 signed CLASS l'!; CLASS PROP INFO INPUT NO CYS REC'D uvcKET NO:
XXX 1
50-289 DESCRIPTION:
ENCLCSL3ES:
reporting abnormal occurrence No. A0 50-289/
7'.-9...concerning.... Failure of Makeup and Purification Pump 1A due to inadvertent operation with an isolated suction line......
PLANT NAME:
Three Mile Island FOR ACTION!!N7C 'uTIC '
6-26-74 JB BUTLER (L)
- SCHWENCER (L)
ZIEMANN (L)
REGAN (E)
W/ CYS W/ 7CYS W/ CYS W/ CYS CLARK (L)
STOLZ (L)
DICKER (E)
W/ CYS W/ CYS W/ CYS W/ CYS Pr33. (L)
'.'?.SSt.LLO (L) le'ICHTC:' (E)
W/ CYS W/ CYS W/ CYS W/ CYS KNIEL (L)
PURPLE (L)
YOUNGBLOOD (E)
W/ CYS W/ CYS W/ CYS W/ CYS INTERNAL DISTRIBUTION hREGFI]g TECH REVIEW DENTON LIC ASST A/T IND
- AEC PDR M NDRIE GRIMES DIGGS (L)
BRAITMAN
/0GC SCHROEDER GAMMILL GEARIN (L)
SALTZMAN
/MUNTZING/ STAFF
/MACC/ RY KASTNER
/GOULBOURNE (L)
B. HURT
/ CASE 4 NIGHT BALLARD KREUTZER (E)
GIAMBUSSO 4 AWLICKI SPANGLER LEE (L)
PLANS
/ A0 MAIGRET (L)
MCDONALD BOYD SH
- MOORE (L)(LWR-2) v3TELLO ENVIRO REED (E)
CHAPMAN DEYCUNG (L)(LbTs-1) d CUSTON MULLER SERVICE (L)
DUBE w/ input SKOVHOLT (L) d OVAK DICKER SHEPPARD (L)
E. COUPE GOLLER (L)
DOSS KNIGHTON SLATER (E)
P. COLLINS VIPPOLITO YOUNGBLOOD SMITH (L) 4. THOMPSON (2)
DENISE
/TEDESCO REGAN TEETS (L) v'KLECKER M EG OPR vl0NG PROJECT MGR WILLIAMS (E) v"EISEN,4UT)79
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FILE & REGION (3)
/LAINAS WILSON (L)
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4 - LOCAL PDR Harrisburg. Pa.
v1 - TIC (A3ERNATHY)
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Dear Sir:
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Operating License DPR-5 Docket No. 289 In accordance with the Technical Specifications for the Three Mile Island Nuclear Station, Unit 1, we are reporting the following abnormal cccur-rence:
(1)
Report Number: A0 50-289/7h-9 (2a) Report Date: June 21, 1974 (2b) Occurrence Date: June 11, 197h (3)
Facility: Three Mile Tsland Nuclear Station, Unit 1 (h)
Identification of Occurrence:
Title:
Failure of Makeup and Purification Pu=p 1A due to inadvertent operation with an isolated suction line.
Type:
An abnormal occurrence as defined by the Technical Specifi-cations, paragraph 1.8d, in that the rump failure may have threatened to cause an Engineered Safeguard System to be incapable of performing its intended function.
(5)
Conditions Prior to Occurrence: The Peactor Ccolant System was in hot shutdown condition, with major plant parameters as follows:
Pcwer:
Core:
0 Elec:
0 RC Flev:
lhl.o X 10 lbs/hr RC Pressure: 2155 psig
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Directorate of Licensing June 21, 1974 RC Temp.:
532 F PRZR Level:
125 in.
PRZR Temp.:
650 ?
(6)
Description of Occurrence: At 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br /> on June 11, 197h, Makeup and Purification Pump 1A started on a false F.ngineered Safeguard signal and ran for a short period of time with its suction valve closed. The pump was i==ediately secured and checked for damage.
It was found that the pump shaft could not be turned by hand, as had been done the previous night, indicating that there was inter-nal pump damage.
(7)
Designation of Apparent Cause of Occurrence: At the time of the occurrence, investigative maintenance was being performed on the partially energized relay lx3A/RCA, which forms part of the Engi-neered Safeguard System's manual actuation logic. Due to their close proximity, relays 1xlA/RCA and 1xlB/RCA, while in a partially energized condition, could conceivably be actuated by an uninten-tional bump. It is believed that in the present instance this is what happened.
A further investigation revealed another ccndition which apparently compounded the problem.
It was found that incandescent bulbs had been installed on the backlighted switches of the console instead of the prescribed neon bulbs and that incorrect resistors had also been installed. As a result, relays 1x3A/RCA, lxlA/RCA, and lx13/RCA probably had higher-than-ncr=al quiescent voltages, which could have further resulted in relay instability.
An unusual service condition compounded the problem even further in that maintenance was being performed on Makeup and Purification Pump 1C.
At the time, the suction piping for Makeup and Purifica-tion Pump 1A was lined up only to the 3 crated Water Storage Tank through the nor= ally closed, remote-operated MU-V-lhA Valve. This valve normally opens en an Engineered Safeguards signal from the 1x3A/RCA relay; hcvever, this valve did not actuate, even though it was partially energized.
(8)
Analysis of Occurrence:
It is believed that the failure of Makeup and Purification Pump 1A did not represent a threat to the health and safety of the public, because the plant's safeguards syste=
vas not adversely affected, in that during an LOCA only one of the injection lines is required to provide core protection.
(9)
Corrective Actions:
I==ediate corrective actions, in additien to those described above, involved a.
removing the incandescent bults and replacing them with the proper necn bulbs; and b.
initiating a test to verify that the manual actuation relays were performing their desi gn functions.
1481 134
IDirectorate of Licensing June 21, 197h
~
The Plant Operations Review Committee (PORC) met prc=ptly after the incident and reco== ended the follcving long-tern actions, with which the Station Superintendent concurred:
a.
replace all resistors, as necessary, with ones having the proper resistance; b.
initiate an investigation on the advisability of adding addi-tional pump protecticu, such as a low-suctica pressure trip.
As of this date, action has been initiated on both of these items by the Station Superintendent.
(10) Failure Data: Not Applicable.
Sincerely, i
R. C' ' Arnold Vice President-Generatien RCA:JFV:sh File 7 7 3.5.1 20.1.1 cc: Directorate of Regulatory Operaticns, Region 1 U. S. Atomic Energy Co==ission 631 Park Avenue King of Prussia, Pennsylveni..
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