ML20126F118

AO 50-213/75-3:on 750904,greater than 2 Delta Dissolved Oxygen Alarm Received.Caused by Oxygen Scavanging from Canal Water on Start of Dredging Operation.Backup Sys Started. Monitoring & Grab Sample Results Encl

ML20126F118
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	09/05/1975
From:	Hartley F CONNECTICUT YANKEE ATOMIC POWER CO.
To:
References
AO-50-213-75-3, NUDOCS 8103060841
Download: ML20126F118 (2)

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AbN0'TlLi OCCURRENCE REPORT 60- 2t 3 Report Utr6er: 50-213/75-3 Report Dctu: September 5, 1975 Occurrence Date: September 4,1975 Facility: Haddan Hec k Plant Connecticut Yatikee Atomi; Power Comnany Idnetification of Occurrence: Correspondence CYH-3058; Seetember 5, 1975; Tech. Spec. B, Section 2.3.3.1; Diss. Oxygen Conditions Prior to Occurrcnce: Steady State Power Descrintion of Occurrence:

A greatcr than 2 delta dissolved oxygen alarm was received across the plants cooling uater on 9/d at 0930. Grab samples were taken and analyses rude to veri fy coriditions. It was not ii.rediately apparent what could be causing this condition and sampling %dicated we were back in specifications by 1235 on the san.2 day. Tne grab samples also identified that the continuous monitors were not functioning properly even though they had alarmed. He switched to our back-up system. Attachnent A is a record of our continuous monitoring results and grab samples spanning this period.

Designation of Anonrent Cause of Occurrence _:

Unusual Service Condition Including Environnental Analysis of Occurrence:

There was no traceable clant event that paralled the time span of this occurrence. However, c.. aging in the canal upstream of the monitor had started on the same day. It is conceivable and believed that reducing material icosened on the start of the dredging operation scavanged oxygen from the canal water. The dissolved oxygen parameters have remained within acceptable limits since this occurrence.

Corrective Action:

Tnis event is not considered remediable by corrective plant operation.

Failure Data:

See Attachment.

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[ Attacl- -)t 50 'i13/75-3 Ill-00T IfiTAKE DISCH. , _

PACKAGE GRAB SAMPLE PACKAGE GRAB SAMPLE  ;

DATE TIIiE D155. O DISS. 02 DISS. 02 0.1S5. 02- A DISS 02

,9-4-75 0920 4.4- 9.0 > +2.0 Package S-4-75 1030 5.0 8.5 8.8 4.5 - 4.0 Grab 9-4-75 1100 6.4 9.0 > +2.0 Package 9-4-75 1205 6.2 8.7 9.2 l

9-4-75 1220 6.3 9.3 6.5 - 2.2 Grab 9-4-75 1235 7.2 9.2 7.6 - 1.1 Grab {

9-4-75 1245 7.2 9.15 8.1 - 0.6 Grab 9-4-75 1300 7.2 9.1 9.2 4 9-4-75 1315 7.2 9.4 9-4-75 1400 7.6 9.1 8.4 - 0.7 Grab 9-4-75 1600 8.0 8.8 + 1.1 Package j

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P C O N N ECY g C U T VA N SC MM ATO M f C P" O W E R COMPANY

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• ,'[ HAODAM NECK PLANT

• pew a s. unox sarr. EAST H AmenoN. ccrw o=424 ,

January 73 1976 CYH - 3160 U. 5. Nucl ea r Regu Ta tory caserri s s ion Directorate of Regu1 story 0;aeratic>ns Hegion I h h #m ,. o 3 631 Perk Avenue t Ki ng o f Pru s sia . Pennsylvanta 19506 Attention: P' r . James P. O'Refily.

Director Ocar Hr. O'Rc411y-In acroccance with the reportino requirements of Connecticut Yanben Technical spec i f ica t ions . Section G.9.2.a. the following prefirinary renort "p(ressure concerninais 7 5 -1 LP )transettters thehereby r.si runction sutei t ted. of two nain stean emcess flow differential During severe sub-rero weather conditions, sensinn itnes to two high steen flua diffurential pressure transr .i tters frnre. The c oi n e-i d en c e n t" the tw s hich steam flow stq%els satisfied the trippinq lofjic and a reactor /

turbine trip occurred from fu17 p o w e r- (s SD3 Pr.(e ) . Tne instru ent sens1ng lines were thawed and the ins trv%n ta tion return ed to n o rs .a l .

i Tne instru w=ntw in quention are housed in en enclosure attached to the ';

outside of the Henctor contein w nt. Sub-zero coupled with scre openingr. Inadvertently lefttaw- in .s erawall the tu re ass and stronn wints a result of a recent (hion eneroy nine break) rodification to the enclosure overcam the encler.ure hen ti n g systm and caused locyl freezing of the sensing lines.

The enclosure but1 ding openings were pT u gg ed ans addi tional free 7e pro-tection was applied to the sensing lines.

Very truly yours, d s/A . t ~

Rfchard H. Graves Plant Superintendent FUlG/ved

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