ML19347C451
| ML19347C451 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/12/1977 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 8011190460 | |
| Download: ML19347C451 (1) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION J '@ + < i 4 necion :
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.7d Yankee Atomic Electric Company m
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Mr. Robert H. Grace
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'N Licensing Engineer N:
20 Turnpike Road Westborough, Massachusetts 01581
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Gentlemen:
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Enclosed is IE Bulletin No. 77-03 which requires action by you with regard to your power reactor facility (ies) with an operati~ng license or j
i a construction permit.
1 Should you have questions regar' ding this Bulletin or the actions re -
I quired of you, please contact this office.
L Sincerely, Of t Boyce H. Grier
' Director j
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Enclosure:
IE Bulletin No. 77-03 cc w/ encl:
i H. Autio, Plant Superintendent Donald G. Allen, President l
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-(Extracted From W Technician Bulletin NSD TB 77-11) j
Subject:
PERIODIC TESTING OF SAFETY INJECTION RESET TIMING h
CIRCUIT i
i flumber:
NSD-TB-77-11 t
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[N System (s):
Solid State Protection System (SSPS)
Date:
July 21, 1977 Affected Plants:
All with above supplied equipment fi S. O. (s):
385 l
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References:
SSPS Schematic, Sheet 20 g
I' BACKGROUND IttFORMATION j
A portion of the safeguards actuation reset circuitry which would not normally be tested during periodic on-line testing of the Solid State Protection System has been re-evaluated and does now require periodic-test. The specific circuit consists of timing relay TDl, slave relay K602, control board SI block / reset pushbutton and associated wiring including wiring back to universal card A216-19 beyond which is included in the semi-automatic logic tests.
Should any part of this circuit fail, safety injection could not normally be reset and/or-I blocked to allow initiation of recirculation.
Westinghouse has concluded that this constitutes a potential substantial safety hazard and has notified the U.S. flRC in accordance with reporting i
requirements.
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IMMEDfATECORRECTIVEACTI0tl The following scheme is to be employed during periodic on-line testing g
of the Solid State Protection System:
In 1.
Place " Input Error Inhibit" switch on logic test panel to "In-hibit."
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!N 2.
Place the " Mode Selector" switch in output cabinet to " Test."
N Select position 9 on " Memories" switch on the logic test panel and, if the " Memory Set" light is on, depress the adjacent black push button to extinguish.
COPY t
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l' COPY In order to verify that all contacts returned to their initial con-ditions, do the following-
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N 13.
Connect the voltmeter between TDl-6 (+) and logic ground (Gild).
The meter should read 48 VDC (nominal).
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,,9 14.
Switch to ohms Rxl range and measure for an open circuit between
@,j TD1-2 and logic ground (Gild).
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15.
Connect the meter to read volts AC (150 VAC Range) across TDl-1 and 5.
The meter should read 0 VAC.
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16.
Switch to Rx1 range and measure for an open circuit between TDl-1 and 5.
17.
If applicable, return the slave relay K602 external testing circuit to its nonblocking state thus restoring the entire system to full service.
The circuit has now been verified as being in its initial state after having performed.
Page 3 cf 3 COPY I
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Date: September 12, 1977 I
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Report to this office in writing within 45 days for facilities with
'an operating license and within 60 days for facilities with a P,3 construction permit, your ? an cf actica with reg rd to Item 1.
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c-e Approval of flRC requirements for' reports concerning possible generic 9
problems has been obtained from the U.- S. General Accounting Office.
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(GA0 approval B-180225 (R0072, expires 7/31/80).
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Enclosures:
1.
Extract from W Technical I
Bulletin flSD TB 77-11 Entitled:
Periodic Testing of Safety Injection Reset Timing Circuit 2.
List of IE Bulletins Issued in 1977 i
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If K602 actuates an~y external loads, first block these loads from
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the external test circuitry.
Do not attempt to energize K602 frcm
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Inis circuitry.
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f 5.
Connect a DC voltmeter (Simpson Model 26). bet 9een time delay relay i
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(TD1) terminal 6 (+) and logic ground (GND) on the logic test panel h
y using the 50 volt scale.
The meter should read 48VDC (nominal).
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6.
Move the positive (+) probe from TDI-6 to TDl-2. The meter should i
3 read 0 VDC.
y 7.
Latch-up K602 by physically depressing the latch plunger and i
releasing. Tirca the interval beginning with that action until the M
volt meter reads 48 VDC (nominal).
This period should agree with that specified on the applicable technical specification.
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8.
From the main control board, firmly depress and release the SI A
block / reset pushbutton and the following will occur simultaneously:
The "l'emory Set" lamp will light.
a.
b.
The voltmeter will go to zero.
K602 will reset as evidenced by the protruding latch plunger.
c.
At this point, the operation of K602 and latch, the operation of U
iD] coil and contacts, the application of an SI block (memory set light), the operation of the control board reset switch and all associated wiring has been checked and verified.
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9.
Return the " Memories" switch to "Off" position.
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10.
Peturn the " Mode Selector" switch to " Operate."
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11.
IMPORTANT:
Since use of the " Memories" switch could have negated valid blocks which existed before its use, reinstate all blocks
- 3 from the control board by actuating ALL manual block pushbuttons.
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- 12. After performing step 11, return " Input Error Inhibit switch to
"::ormal. "
Enclosure i Page 2 of.i COPY
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i NUCLEAR REGULATORY COMMISSION i.
OFFICE OF INSPECTION AND ENFORCEMEilT WASHINGTON, D. C.
20555 iM d@
'Date: September 12, 1977 hi ON-LINE TESTING OF THE WESTINGHOUSE W SOLID STATE PROTECTION SYSTEM
@I (SSPS)
Description of Circumstances:
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Westinghouse has recently reported that operation of the' safeguards l
actuation block / reset circuitry is not being verified during the peri-odic semi-automatic logic testing of the Solid State Protection System 1
as required by licenseet technical specifications.
Even though this j
portion of the logic system is tested prior to initial plant operation,
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circuit failure during operation is undetectable. Consequently, if.any
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part of this circuitry fails, safety injection'could not normally be reset and/or blocked. Resetting and blocking of safety injection signals are necessary for switchover to the recirculation mode of operation I,
during accident conditions. The enclosed W Technical Bulletin flSD TB-77-11 was sent to affected Westinghouse plants notifying them of the problem and of the corrective action necessary to resolve the issue.
j The technical bulletin provides detailed information to augment estab-g
.lished on-line test procedures. The method has been confirmed recently.
by successful verification tests of the WSSPS at both W Nuclear Instru-mentation and Control Division (WNICD), Hunt Valley, Maryland, and florth Anna Nuclear Station.
3 Action To Be Taken By Licensees and Permit Holders:
For all W Power Reactor Facilities with an operating license or a con-struction permit:
t 1.
If your facility utilizes or plans to utilize the WSSPS, describe l
what action you have taken or plan to take to assure adequate periodic testing of all portions of the system.
Furtner informa- '
t tion regarding the necessary periodic testing procedures can be p.
obtained from Westinghouse Nuclear Energy Systems in Monroeville, g
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Pa.
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