ML19259D462
| ML19259D462 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/03/1975 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | |
| References | |
| GQL-1469, NUDOCS 7910240685 | |
| Download: ML19259D462 (4) | |
Text
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NRCI-..iTRIBUTION FOR PART 50 DOCK M ATERI AL (TEMPORARY FORM) f CONTROL NO:
9404 FILE:
Enviro 5-l
( ROM: Metroplitan Edison Co.
DATE OF DOC DATE R EC'D LTR TWX I RPT OTHER Reading, Pa R.C. Arnold 4 3-75 75 vvv TO:
ORIG CC OTHER SENT NRC POR m
Mr. J.P.0'Reilly not-signe<l SENT LOCAL PDR xx CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
xxx 50-289 DESCRIPTION:
ENCLOSURES:
Ltr reporting Environmental Incident Report
- 75-08 on 8-26-75 concerning excessive
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cooling of Mechanical Draft Cooling Tower
( MDCT) dischatge........
PLANT NAME:
Three Mile Island #1 FOR ACTION /INFORMATION 9-6-75 JGB BUTLER (L)
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POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 923-3601 September 3> 1975 GQL 1k69 i~
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Mr. J. P. O'Reilly, Director office of Inspection and Enforcement, Region l'
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U. S. Nuclear Regulatory Consission 631 Park Avenue l'-
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King of Prussia, Pennsylvania 19406 h., -
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Dear Mr. O'Reilly:
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'q operating License Noi DPR-50 Docket No. 50-289 Three Mile Island Nuclear Station Unit 1 Environmental Incident Report No. 50-289/75-08 In accordance with the Environmental Technical Specifications for Three Mile Island Nuclear Station Unit 1, we are reporting the following Environmental Incident:
(1)
Reporting Number:
E.I. 50-289/75-08 (2a) Report Date: September 2, 1975 (2b) Incident Date: August 26, 197.t (3)
Facility: Three Mile Island Nuclear Generating Station Unit 1 (TMI-1)
(k)
Identification of Incident:
Excessive cooling of Mechanical Draft Cooling Tower (MDCT) discharge, which is a violation of the Environmental Technical Specifications, paragrcph 2.1.a (1), and constitutes violation of a Limiting Condition for Operation.
(5)
Conditions Prior to Occurrence:
The reactor was at Steady State Power with major plant parameters as follows:
Core:
100%
1459 125 Elec.: 825 !Ge 6
BC Flow:
139 x 10 RC Pressure:
2155 psig Sh0P
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- a RC Temp:
580 F PRZR Level:
239 in.
PRZR Temp.:
558 F (6) Description of Incident:
On August 26th vater with a temperature of 3.N F below the ambient river temperature (880F at the time) was discharged from the Unit 1 Mechanical Draft Cooling Tower (ICCT). This temperature drop occurred when a cold front moved through the area causing a rapid change in the ECT operating conditions.
I==ediate corrective action was taken to regulate the MDCT and the allovable temperature differential was restored within 15 minutes.
(T) Designation of Apparent Cause of Incident:
Unusual environmental condition, io that the cold front roved into the area so quickly (the ambient air temperature dropped from 880F to 76 F in 30 minutes) that the rapid change in MDCT operating conditions which it brought about could not be anticipated. Also, at the time of the incident the ambient river vater temp =rature was greater than 87 F, which established the differential temperature envelope at 0 to -3 F and thereby greatly reduced the time available to the Control Room Operator for taking preventative action.
(8) Analysis of the Incident:
It is believed that the negative temperature differential reported here did not cause any environmental damage in that the condition lasted only a short time (15 minutes) and was not so severe as to greatly alter the ambient temperature of the river.
(9) Corrective Action:
The only immediate corrective action taken was to restore the temperature differential to within the allevable range by adjusting the MDCT controls.
At a meeting held 4-diately after the incident was reported, the Plant Operation Review Committee (PORC) reviewed and gave its approval of this action.
In addition, they recoc= ended to the Station Superintendent that as a long-term action the need to request a change to the Environmental Specifications be evaluated.
(10)
Failure Data:
E.I. 's 74-1, Th-8 and 75-7 all involved excessive negative temperature differentials, although in only the first two cases were these excessive tenperature diffemntials related to material failures.
Sincerely, Signed: R.C.ARNCLD l4JI i d,D Ce R. C. Arnold Vice President RCA:JFV:tas
O cc: Director Division of Reactor Licensing U. S. Nuclear Regulatory Co::: mission Washington, D.C.
20555 File:
7.7.3.11.1 20.1.1 1459 127
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