ML20084R840

AO 50-249/74-37:on 740716,torus Oxygen Concentration Above 4% After 24 H.Caused by Nitrogen Supplier Failing to Meet Delivery.Vendor Notified & Util Advised That Original Order Had Been Lost

ML20084R840
Person / Time
Site:	Dresden
Issue date:	07/22/1974
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Oleary J Office of Nuclear Reactor Regulation
Shared Package
ML20084R842	List: ML20084R840 ML20084R845
References
510-74, AO-50-249-74-37, NUDOCS 8306150611
Download: ML20084R840 (2)

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Post O!!;c Box 767

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BBS Ltr.0510-74 Dresden Nuclear Power Station R. R. 91 d'~ ~

Iforris, Illinois 60450

- A July 22, 1974

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Mr. J. F. O' Leary, Director .

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4 * ' e i Directorate of Licensins U. S. Atcaic Ener g~ y Cecission Washingt6n, D. C.

50-249  %/ % "'66y N

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SUEJECT: _ REFORT OT AB"ORM\L OCCUP"ANCE TER SECTION 6.6.B. I.a OF THE

_TECliNIG L SP_ECIFICATIO.i .

CONTAI:M NP C.NYCEN Col'CEN"IRATION OUT Or LINIT.

References:

1) Regulatory Guide 1.16 Rev.1 Appendix A

2) Nctification of Regica III of AEC Regult.cory Operations Telephone: fir. F. Maura, 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> on July 16, 1974 iclegrc.n: Mr. J. Reppler, 1353 hours0.0157 days <br />0.376 hours <br />0.00224 weeks <br />5.148165e-4 months <br /> on July 16, 1974

3) Dresden Stction P6ID M25 Parrrt M = 5:r: 5'.'-2'.9/19 7'; 2 7 Report Date: July 22, 1974 Occurrence Dcte: July 16, 1974 -

Facility: Dresden Neelear Power Station, Morris, Illinois IDEftTIFICATION OF OCCURRF.NCE Torus o.tygen concentration above 47, af ter 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

CONDITIONS PRIOR TO OCCORRENCE On July 17, 1974 a request was made for additional nitrogen.

Delivery was promised by 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on July 14, 1974. Th: unit was in shutdown and scheduled to start-up by 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on July 16 1974.

DESCRIFTION CF OCC'.TRRENCE On July 14, 1974 start-up of the unit begin. The unit was pieced  ;

in the run node at 0935 hours0.0108 days <br />0.26 hours <br />0.00155 weeks <br />3.557675e-4 months <br /> on July 15,197'.. Inm tin ~, of td. drywell sens '

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e30A150611 740722 N!5~I

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WPY SEN1' REGION / . =

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Mr. J. Y. O'Lecry d" July 22,1974 terminated at 2140 hours0.0248 days <br />0.594 hours <br />0.00354 weeks <br />8.1427e-4 months <br />, July 15, 1974 because a level of 57 inches had been reached in the nitrogen storage, tank and additional nitrogen had not been received. Termination of inerting uas an attcept to ec= ply to Tech-nical Specification 3.7.6.6 which requires icvel to be 60 inches when either Unit 2 or 3 is at power. Af ter sacples were taken and calculations

. performed, it was discovered that additicnal nitrogen was required.

Inertir.g again commenced, however, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 4% oxygen limit had been exceeded.

ilt the termination ot 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the oxygen concentration was 4.5%. The exygen concentration was within the 4% limit at 1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> on July 16, 1974.

DESIG!MTION 07 AFpAREIT* CAUSE OF OCCURREUCE The cause of the occurrence was the nitrogen supplier failing to meet his delivery date of July 14, 1974.

ft*3 LYSIS OF OCCURRENCE The failure to meet the 4% oxygen concentration limit did not put the cafety of the plant or public in jeopardy. At the end of the 24 hcur period, o;;ysen concentration had excteded the lunf t by only .5%. In addition, the 4% limit was rct by 1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> on July 15, 1974.

CORRECTIVE ACTION The vendor was called when the delivery did not crrive on time.

It une then learned that the vendor had lost the original order. Thir. is the first time this problen h:s occurred and the vendor has oscured us it will not happen egain. This is considere'd en icolated incidant and no further corrective actions are required.

FATLURE DAT/. ,

No previous occurrences of this type were reported since the applicable Technical Specification has only been in effcet since April 19, 1974.

Sincerely, ug,Y c 2' 8h'. E. Stephenson v Superintendent BBS:TEL:do

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