ML20084E492

Telecopy Message of Ao:On 700818,overpower Rod Stop & Reactor Trip Bistable TC-407/B Found Faulty.Bistable Replaced

ML20084E492
Person / Time
Site:	Ginna
Issue date:	08/19/1970
From:	Sweet J ROCHESTER GAS & ELECTRIC CORP.
To:	Kirkman R US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084E449	List: ML20084E447 ML20084E492
References
NUDOCS 8304150091
Download: ML20084E492 (2)

Text

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.. n 446P EDT AUG 19 70 PB394 SYF264 SY RHA249 BR PDF 4 EXTRA ROCHESTER NY-19 258P EDT ,

(- i R W KIRKMAN, DIRECTOR REGION 1 DIVN OF COMPLI ANCE USAEC

!c 970-BROAD ST NEWARK NJER ,

THIS IS TO CONFIRM MY CONVERSATION AT 1420 HQURS THIS DATE, fi WITH MR MOSLEY IN REGARDS TO AN ABNORMAL OCCURANCE THAT CAUSED .,, j j' A CONDITION THAT WAS DETECTED ON AUGUST 1F 1970 AT ABOUT 1500 ' i j, HOURS THE PERIODIC TESTING OF REACTOR PROTECTION SYSTEM CHANNEL , j

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i' em 3 BEGAN, WITH THE OVER POWER DELTA-T TRIP PROTEQTION FOR THIS '

h CHANNEL PLACED IN THE TRIP MODE STOP AT 1533 HOURS THE OVERPO gD_ f 88 ROD STOP AND -REACTOR TRIP BISTABLE, TC-407/B WAS FOUND TO DE 3 ' 'k

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O FAULTY STOP IMMEDIATE REPLACEMENT OF THIS BISTABLE WAS BEGUN

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fg ON. AUGUST 19 1970 IT WAS DECIDED, SINCE THE FAULTY BISTABLE

i WOULD AFFECT THE REACTOR TRIP SET POINT, TO INVESTIGATE THE p ma.m EXTENT OF THIS AFFECT STOP THE RESULTS OF THIS INVESTIGATION l (R$49) b

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.n SHOWED THAT THE CONDITION OF THEz FkULTY BISTABLE HAD BEEN SUCH AS TO CAUSE THE SET POINT, FOR STABLED CONDITIONS, TO BEGIN EXCESS OF THE PRESCRIBED FO'RMULA IN TECHNICAC SPECIFICATIONS, .

, SECTION 2 31.2.E OF LIMITING SAFETY SYSTEM SETTING STOP JAMES F SWEET OPERATIONS ENGINEER GINNE STATj0N ROCH GAS AND ELEC .j ,

1420 18 1970 16 1970 1500 3 DELTA-T 1533 0-1407/B 191970 -

2 3 1.2.E GINNE (319). ,.

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, CF-1201 (R549) i 1

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MEMO ROUTE SUP 5++ me about this. For conct ae. For action.

9 Form AEC-93 (Rev. Af ay 14.1947) AEChi v240 Note and return. For signature. For Inform *tlem, 4 TQ (Name and unit) MT1ALS REMARKS g Forwarded herewith is a telegram from J,. P. O'Reilly dilef, RI&EB, CO:HQ '

mT Rochester Gas And Electric Corporation received at CO:I 8/20/70. .

TO (Name and unit) MTIALS REEARKS

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l TO (Name and untt) HTIALS REatARKS I. j c  :. . t ran FROM (Name End unit) REMARKS {

E. M. Howard ' #

Sr. Reactor Inspecto c 03000 ( j JCO:I I i i *

.l PMont sech $

$99'/ DATkET / l0 l

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