ML19317D994

Ro:On 750416,defective Fuel Rod Found in Fuel Assembly 1A19. Cause Unknown After Investigation.Assemblies W/Rod Permanently Discharged from Core.Only Two of 36 Assemblies Examined Defective

ML19317D994
Person / Time
Site:	Oconee
Issue date:	08/20/1975
From:	Parker W DUKE POWER CO.
To:
References
NUDOCS 7912100666
Download: ML19317D994 (3)

Text

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NRC DISTRIBUTION FOR PART 50 DOCKET MA19RI AL (TEMPORARY FORM) 9029 CONTROL NO:

FILE. INCIDE!TT REPORT Fr-5 'i FROM: Duke Power co. DATE OF DOC DATE REC'D LTR TWX RPT OTHER Charlotte, N.C. 28242 Vm. O. Parker. Jr. 8-20-75 5-2-75 XX

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TO: ORIG CC OTHER SENT AEC PDR XX Mr. Norman C. Moseley 1 signed . SENT LOCAL PDR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

XXX 1 50-269 DESCRIPTION: Ler ce their 4-10-75 submittal'.. , ENCLOSU RES:

furnisning addl info on defected fuel rod which was discovered on 4-16-75..... Fuel Rod <

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Assembly 1A19..... .

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$ttar E#0tes09'ON 373-4063 August 20, 1975 Mr. Norman C. Moseley, Director $.4. p '~~

U. S. Nuclear Regulatory Commission Suite 818 230 Peachtree Street, Northwest g' . _.__

Atlanta, Georgia 30303

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Re: Oconee Nuclear Station Unit 1 I Docket No. 50-269 i_

Dear Mr. Moseley:

b On April 10, 1975. Duke Power Company submitted Abnormal Occurrence Report A0-269/75-3, " Defects in a Fuel Rod of Spent Fuel Assembly s _

1A10," which reported the identification of a defected fuel rod in spent Fuel Assembly 1A10 during the course of the post-irradiation examination of once-burned Oconee 1 fuel assemblies. Following this occurrence, a defected fuel rod was also discovered in discharged Fuel Assembly 1A19, on April 16, 1975. NRC/OIE, Region II, was notified of this incident by telephone on the occurrence date.

Subsequently, all scheduled irradiation examination of fuel as-semblies has been completed and no other defected fuel rods have been observed. The following details concerning the fuel rod defect in Fuel Assembly 1A19 are provided for your information.

The defected fuel rod of Fuel Assembly 1A19 is a peripheral rod.

The defect, a hole of approximately k" diameter in the cladding, is located between the second and third intermediate spacer grids from the top of the assembly. Visual examination of the defect confirmed the presence of fuel at the location of the hole.

As with Fuel Assembly 1A10, lA19 (located at core location M-9 during Cycle 1 operation) contained an incore detector string and a control rod of a safety group, which was fully withdrawn throughout Cycle 1 operation. A review of the Cycle 1 power history in this fuel assembly did not indicate any abnormal conditions that could have affected the htegrity of the fuel rod.

A repoeted in A0-269/75-3, the primary coolant fission product activity during Cycle 1 operation was less than 3.0 percent of the Technical f

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l Mr. Norman C. Moseley Page 2 August 20, 1975 Specification limit. Out of the approximately 2000 peripheral fuel rods in 36 fuel assemblies examined during the post-irradiation examination program, only the two fuel rods identified were seen to be defected.

It is also to be noted that the two assemblies with the defected fuel rod have been permanently discharged from the core.

It is concluded that this occurrence did not constitute a hazard to the safety and health of the public.

Ve truly yours, a

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' William O. Parker, Jr.

PMA:vr cc: Mr. Roger S. Boyd l

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