05000289/LER-1977-020, Forwards LER 77-20/04T-0

Forwards LER 77-20/04T-0

ML19261F107
Person / Time
Site:	Crane
Issue date:	08/12/1977
From:	Herbein J METROPOLITAN EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19261F108	List: 05000289/LER-1977-020, Forwards LER 77-20/04T-0 05000289/LER-1977-020-04, /4T:on 770719,during Passage of Storm Front,Station River Water Discharge Temp Fell to in Excess of 3 F Below Inlet Temp.Caused by Storm Front.A & B Mechanical Draft Cooling Fans Stopped
References
NUDOCS 7910240263
Download: ML19261F107 (4)

LER-1977-020, Forwards LER 77-20/04T-0

Event date:
Report date:
2891977020R00 - NRC Website

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DISTRIBUTION:

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UNITED STATES Rdg.

NUCLEAR REGULATORY COMMISSION RIngram WASHINGTON. D.C. 20555 August 29, 1977 Docket No.

50-289 Addressees: See next page

Subject:

'Ibe following documents coocerning our review of the subject facility are transmitted for your information:

Notice of Receipt of Application.

Draft / Final Environmental Statement, dated Safety Evaluation, or Supplement No.

. dated Notice of Hearing on Application for Construction Permit.

Notice of Consideration of Issuance of Facility Operating License.

App c.ation and Safety Analysis Report, Vol.

Amendment No.

to Application /SAR, dated Construction Permit No. CPPR-

. dated Facility Operating License No. DPR.

, dated Amendment No.

to CPPR-or DRR-

, dated X'

Other: Licensee Everit Roonet Rn 8;n '>Ao/77 2nfar O

Division of Ooeratino Reactors, ORBf4 Office of Nuclear Reactor Regulation

Enclosures:

As stated cc:

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METROPOLITAN EDISON COMPANY sussiman cr atianuusucur:urus acnonna..

TELEPHONE 215 - 923 2501 POST OFFICE COX 542 READING. PENNSY LVANI A 19C03 kagust 12, 1977 GQ.L 1013

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Mr. B. H. Grier, Director Office of Inspecticns and Inforcement, Regicn 1 J g ",

U. S. IIuclear Regula cry Cc =ission

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631 Park Avenue

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King of Prus ta, Pennsylvania 19hC6

Dear Sir:

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Docket !!c. 50-269 Operating license :!c. JFE-50 In acecrdance with the Technical Specifications of cur Three Mile Island I!uclear Statien Unit 1 (T.E-1), ve re reporting the fcileving reporticle occurrence.

This repcrt is being sut=itted late per the telephone conversatien with Mr. Streeter on kagust 10, 1977.

is late lue to a clerical errer.

To prevent a future cecurrence This report of this tree an additional positive check-off has been added to the tracking system.

(1) Repcr :Iu=ber: 77-20/kT Dpf0 ]@p p, p o&

'A. W M G s' d

udi 2 u J (2a) Required Reper: Date: 6/2/77 a

(2b) Este Of Cecurrence:

7/19/77

'n.ree /ile :sland :iuc' c atica - Unit 1 (3) Facility:

(i)

Identifica: ice of Occurrence:

C Statien Eiver h;er Discha ge Te=perature exceedei 3 F Title:

belev inlet te perature.

A reperti::le,ccrrence as defined by Irviren=ertal Tjpe:

Technical Specifics:icn; 2.1.1(1) in tha: the sta:icncf river va:er discharge :enpert: re exceeded to lini:

3c? belev the inle river vster tempera: re.

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Mr.'3. H. Grier, Dire

' Auguet 12, 197J GQL 1013 (5) Conditiens Prior to Cccurrence:

Fever:

Cere: 251? MWt Elec: 804 sWe Gross 0

RC Flev:

lh5 x 10 lbs/hr RO Fressure:

2166 psig 0

RC Te=p:

579 F FRZR Level 223 inches 0

FRZR Te=p:

650 F (6) Description of Occurrence:

On 7/19/77, while operating at steady state cenditiens, a ster = frcnt passed through the area at apprcximately 1635 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.221175e-4 months <br /> reculting in a rapid increase in vind velocity frc= 5 to 35 =ph and a rapid decrease in a bient air te=perature frca 9h0F to 52cF.

The effect of thin transient was to decrease the river vater discharge te=perature.

Frier to this transient, river water AT vas being =aintained between -1 and -2cy 37 go 333ure ec=pliance with ETS 2.1.a(3) since inlet river water temperature v C

above 67 F.

At approxi=ately 1637, the Centrol Rec Opera:cr shut-off the A and 3 MDCT fans to decrease the effect of the stcrs frcnt en the rivt.r water AT.

Despite this ccrrective reasure, the river vater LT C

exet eded the 3 F LT li=it for about ten (10) minutes, reaching a taxinu=

O f.'. 907 c' "a.

(7) Apparent Cause of Occurrence:

It has been determined that the cause of this cecurrence was due to a stora frcnt passing thrcush the area.

(8) Analysis of Occurrence:

It has been deter =ined that this cecurrence did not constitute a threat to the health and safety of the public, ner did it cause any env'----=

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damage in that the negative temperature differential transient was nc:

large encush, ner did the cenditien exis; icng encush to significantly alter the anbien temperature cf the river.

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August 12, 1977

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3-Mr. B. H. Grier, Directt GQL 1013 (9) Corrective Action:

Innediate:

A and 3 Mechanical Draft Cooling Tever fans vere stopped, 0

reducing AT to lesa than -3 7.

Long Ters:

None (10) Failure Data:

Ucne EI Th-8, II 75-7, EI 75-8, R0 ~6-26

Similar Events

Sincerely, b &b$f

/J. G.,Herbein Vice President JGH:DGM: ki Enclosure: Licensee Event Report ec:

Ms. Margaret Reilly Chief Division of Reacter Review PaDER Tulten Builiing Harristurg, PA 17120 kk0