ML19208B206

LER 79-098/01T-0:on 790902,cable Separation Irregularities Were Discovered within HPCI Sys.Caused by Design Error. A/E Currently in Process of Formulating Proposed Design Change Request

ML19208B206
Person / Time
Site:	Hatch
Issue date:	09/11/1979
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208B203	List: ML19208B202 ML19208B206
References
LER-79-098-01T-01, LER-79-98-1T-1, NUDOCS 7909190348
Download: ML19208B206 (3)

Text

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lo12]lThn NSSS rupplier contacled plant manancmog abo _tEt_ passible cable _ separation irreaul_a._ry o a I ities within the HPCI system after discovering a sim. iar problem at another B'<!R plant. I o 4 1 At 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br /> on 9-2-79, with Unit 2 reactor ut steady state power of 2350 ! Lit, olant l

[ITTl I enigneerina hersonnel reviewed wiring diagrams and confirmed a problem with HPCI cable 1 io lc i l ss paration did exist. This is a non-repetitive occurrence. I lo fil l l o 8 l SYSTEAt CAUSF CAtisE COste, vnyg CC")E CODE SU3CODC CD11PONENT CODE SU3CCOF susci;DE o o Isl Fj @ [Bj @ i Al @ l ZI Zl Zl ZI Zl ?j @ W @ [_Z j @

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41 42 4 44 47 CAUSE DESCRIPTION AND CCHRECTIVE ACTIONS h i O IIt m s diccovered th,t the control circuits for Hatch Unit 2 Division'1 2E41-F002 HPCI1 liliI Lstaam isolation valve was routed i th ADS system contral_'b_1_es. SqtarM. ion criteria I ITiT] [ner desian notes was not ret. Design error was the cause of the occurrence. Archi- l i a l tect-encineer was notified of the HPCI/ ADS cable separation oroblem. They at' -

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Cause Description and Corrective Actions (continued)

(PDCR) to provide for proper cable separation by electrical division type.

Uoon receipt of the engineering package from architect-engineer, the pack-age will be reviewed and implemented as necessary. An updated LER will follow design change implementation.

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Narrative Report for LER 50-366/107q-098, Rev. O 1970, (circal by Plant management was contacted on August 31, to possible cable separation supplier in regards supplier's the NSSS the  !!PCI system. NSSS irregularities within such a problem at the discovery of concern stemmed from requested Ii.e. N SSS supplieri another BWR plant and thov routing of the HPCI inboard steam Hatch to review cable On 0-2-70, at 1800 valve for similar problems. NSSS isolation the hours, plant engineering personnel confirmed separation of possible cable supplier's suspicion after having the HPCI system irregularities within investigated the problem. Thetime Unitof2problem reactor una at a steadv confirmation.

state pouer of 2350 MWt at the of the corrective action included notification They Immediate architect-engineer about the cable separation problem.

proposed desig~n change request a

were requested to provide separation. Design change should (PDCR) for proper cable for the inboard stean cables include re-routing of control isolation valves for H PC I and RCIC system so that Causemixing of thisof HPCI, RCIC, and ADS cables will be corrected. Redundant systems deviation is attributed to design of perror.

er f or:ain g their intended were operable and capable functions.

review of the proposed shall include Supplemental action design change request upon receiptFollouing and implementation receipt thereof of the design change.

as a formal an update to the engineering package and its implementation, LER will be issued.

At the time of the occurrence, Unit 1 waswas routing at a reviewed steady state and power of 1892 MWt. Cable inboard steam found with HPCI discropancies were also isolation valve control cable separation A proposed in that design it also change mixed request is with RCIC and ADS cables.

being issued by the architect-engincor as necessary and to upon receipt, provido will proper be reviewed and implemented electrical divisions / systems.

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