ML20003J297

Ro:During First Quarter of 1981,calculated Dose to Bone for Hypothetical Individual Exceeded Tech Spec Limits.Caused by Personnel Error.All Releases Terminated Until Demineralizer Was Installed

ML20003J297
Person / Time
Site:	Sequoyah
Issue date:	05/04/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8105110216
Download: ML20003J297 (3)

Text

,

j ,

TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II p May 4, 1981 , b yi N fG' li s 4

~ ( MA'/ 0 81981x1 Dimotor of Nuclear Reactor Regulation Eo7,

• 5 Attention: Mr. A. Schwencer, Chief ' -

Licensing Branch No. 2 sr Division of Licensing m m U.S. Nuclear Regulatory Commission Washington, DC 20555 Dear Mr. Schwencer In the Matter of ) Docket No. 50-327 Tennessee Valley Authority )

The following is a special mport mquired by section 311.4 of the Sequoyah Nuclear Plant (SNP) technical specifications.

During the first quarter of 1981, the calculated dose to bone of 28 arem (see Enclosure 2) for a hypothetical individual exceeded twice the limits of specifications 3 11.1.2.a and 3 11.1.2.b. Subsequently, the limits of specification 3 11.4 are assumed to have been exceeded over 12 consecutive months because total calculated doses via effluents and direct radiation from SNP may have exceeded 25 arem to a mal individual. We are unable to determine whether the doses calculated to the hypothetical _ maximum individual were actually received by a real individual because the pathway of primary importance is the ingestion of fish caught in Chickamauga Reservoir. The individual is assumed to consume 50 pounds of such fish over the last 12 months.

Enclosure 1 ezplains the cause of the limits being exceeded and the actions taken to prevent mourrence.

Very truly yours, TENNESSEE VALLEY AUTHORITY

) M L. M. Mills, Manager Nuclear Regulation and Safety Sworn to and subso bed before me this day o 1981 OR t

• Notary Public Hy Commission Expires h- h-h Enclosures y

^ " ' " " " """"" * "

8105110#&

. - . ENCLOSURE 1 -

r u -

SEQUOYAH NUCLEAR PLANT UNIT 1 j SPECIAL REPORT 1 1

t j

In January, the liquid holdup tanks at the Sequoyah Nuclear Plant (SNP) were sampled and checked for compliance with 10 CFR 20 by a gamma counting

system. After the %st results were determined satisfactory, the tanks I

were mieased through the radwaste system without ;rocessing.

In the first week of February, the composite of samples taken in January  ;

was analyzed for P-32 as required by the technical specifications. It was then determined that the levels of P-32 that were previously and unknow-  ;

ingly released resulted in calculated doses in excess of 110 CFR 190 limits. All releases were terminated until a demineralizer was installed to process all liquids from the holdup tanks before being released. We therefore anticipate no fiarther violations of technical specifications t

3 11.1.2.

l h

4 1

e

% l l

l l

l 1

e-v--. r---- .,, , s y ,., __-----,-,._m ,_w .__ ,_.-m .,s-, ,,,.,..,_-y,_,7,.-.,-wp.-s_,w_.. .

-7.,,7 %,-, y , ,,, . , - , - _ , , ~ . , - ,..e.. ,. ,,

1

-- a

, ENCLOSURE 2 l SEQUOYAH NUCLEAR PLANT-UNET 1 SPECIAL REPORT ,

.' .. . . r j CALCULATED DOSES _(mrem) FOR 12 CONSECUTIVE MONTHS FROM .*- i RELEASES FROM SEQUOYAH NUCLEAR PLINT TOTAL BODY - -- ORGtN (BONE)

Releases to Releases Liquid 2,eleases Atmosphere Liquid Releases to Atmosphere Second Quarter 1980 2.2x10~1 0.0 5.2x10 1 1.9x10 2 I

Third Quarter 1980 3.5x10 ~1 1.1x10 8 9.1x10 O.9 Fourth Quarter 1980 5.3x10 1 1.2x10 1 1.4x10 1 .1.7x10 -1 7

First Quarter 1981. 1.1x10 8 2.6x10 1 2.8x10 1 2.7x10 ~1 j TOTAL BODY ORGAN (BONE) 12 month '.otal for

, all releases 2.4 .52 )

l 3

o i

Note: There was no identified direct radiation exposure to individuals offsit.e l

i resultant from plant operations.

! , l 4

. t I

1 i l I

- - - , . _..-.,.-_.,r , , . , ei.-... r.... - . , - , , - - , , , , . - # ,_...y., y .n .4y. , - - - . . . , , _ . , .--4 -,,r,-. ,.g