ML19344F018
| ML19344F018 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 07/29/1980 |
| From: | Moody D Maine Yankee |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-06, IEB-80-6, WMY-80-117, NUDOCS 8009120275 | |
| Download: ML19344F018 (4) | |
Text
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MAME'=":a*UARHEE nivmmFMERCCmP.MU
- 4 TURNPIKE ROAD (RT 9)
&NY ENGINEERING OFFICE WESTBORO, MASSACHUSETTS 01581 617-366-9011 O
B.4.1.1 l
WMY 80-117 July 29, 1980 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:
Mr. Boyce H. Grier
References:
(a) License No. DPR-36 (Docket No. 50-309)
(b) MYAPC Letter to USNRC (WMY 80-94), dated June 13, 1980 (c) IE Bulletin No. 80-06, dated March 13, 1980
Subject:
Engineered Safety Feature (ESF) Reset Controls
Dear Sir:
This letter is written to provide further details and justification for components which do not remain in their emergency mode upon reset of an ESF signal at Maine Y.tnkee.
Those components which were identified in our letter, Reference (b), as returning to normal after the reset of a SIAS, CSAS, or RAS signal are listed in Table 1.
The following justifications are offered as a basis for our respective decisions.
The circuits for Items 18,19, and 20 will not be modified since the reset of these components does not adversely affect the overall operation of the plant safety systems. To reset the CSAS signal requires that the conditions which created the CSAS be rectified and; therefore. the restoration of cooling water to these items upon reset of the CSAS should not jeopardize the availibility of the secondary component cooling system as the ultimate heat sink to the respective safety related components.
The circuit for Item 1 (P-14A, 3, S-HPSI pumps) will not be modified since at least one of these pumps would have been running previous to the SIAS signal, with a second pump on standby which will auto start on low pressure in the charging header. Once the conditions which created the SIAS have been rectified and the safety signal reset, these pumps will stay running regardless of the mode of operation and will require operator action to shut them off.
SU09120275 Q
Unitcd Statcc Nucicar R:gulctory C:maisoien July 29, 1980
~
Attcntion:
Mr. Boyca H. Grict Pag 2 2 Therefore, since these pumps serve a dual purpose as both HPSI pumps and as charging pumps for normal operation and will remain running before and after the reset of the SIAS signal, we feel that it wiLL serve no significance to modify these circuits.
The circuit for Items 4, 5, 9, 16, and 17 will not be modified because the re-opening of these valves upon reset of the SIAS signal (if open prior to SIAS signal) does not divert safety injection flow / charging flow from the primary system.
In addition, to reset the safety injection actuation signal, the conditions which created the SIAS must have been rectified.
The remaining items will be modified to prevent a return to normal operations mode under reset of the safety signal.
The appropriate operating procedure will be re'.ised to alert the operator as to which components or valves will return to their normal operating node upon reset of the safety actuation signal. Maine Yankee has scheduled this work to be completed during the June 1981 refueling outage.
We trust the above information is satisfactory; however, should you desire additional information, please contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY hn L J
e g( E. Moody Manager of Operations RHG/ din Enclosure
TABLE 1 COMPONENT COMPONENT SAFETY ACTUATION ITEM _
DESIONATION DESCRIPTION SIGNAL 1.
P-14A, B, S
HCV-204T Charging Pump Suction SIAS Opens (HSI-M-51)
From RWST 3
HCV-204U Charging Pump Suction SIAS Opens (HSI-M-50)
From RWST 4.
HCV-254 Charging Line Stop SIAS Closes (CH-A-33)
Valve 5
HCV-255 Charging Line Stop SIAS Closes (CH-A-32)
Valve 6.
HCV-314 Safety Injection Tank SIAS Closes (SIA-A-12)
Fill Valves 7.
HCV-324 Safety Injection Tank SIAS Closes.
(SIA-A-22)
Fill Valves 8.
HCV-334 Screty Injection Tank SIAS Closes (SI A-A-32 )
Fill Valves 9
FCV-212 Charging Flow Control SIAS Closes (CH-F-38)
'Jalve l
10.
LCV-210Z Boric Acid Tanh to SIAS Closes (BA-A-32)
Chemical Tank 11.
TCV-201K Ht. Ex. E-67 Letdown SIAS Closes (LD-T-S)
Temperature Control Valve 12.
SOV-4008A Charging Pump Primary SIAS Closes (CH-S-119)
System Isolation 13 SOV-4009A Charging Pump Primary SIAS Closes (CH-S-121)
System Isolation 1
1 14.
SOV 4008B Charging Pump Primary SIAS Closes (CH-S-120)
System Isolation 15.
SOV-4009B Charging Pump Primary SIAS Closes (CH-S-122)
System Isolation i
16.
PCV-211 Seal Water Pressure SIAS Cloces (SL-P-3)
Control Valve for RCP
l TABLE 1 (Continutd)
COMPONENT COMPONENT SAFETY ACTUATION ITEM DESIGNATION DESCRIPTION SIGNAL 17.
FCV-216 Charging PPS to Loop SIAS Closes (CH-F-70)
Fill Header Isolation Valve 18.
TCV-1720 Hydrogen Coolers Outlet CSAS Closes (SCC-T-227)
Temp. Control Valve 19 TCV-1721 Turbine 011 Cooler CSAS Closes (SCC-T-257)
Outlet Temp. Control Valve 20.
TCV-1722 Electro Hydraulic 011 CSAS Closes (SCC-T-315)
Coolers Temp. Control Valves 21.
FN-44A, B Spray Room Exhaust Fans SIAS Starts 22.
SOV-3217A Air Control to FCV-3217A RAS Opens FCV-3217A - Vent. HDR to Containment 23 SOV-3217B Air Control to FCV-3217B RAS Opens FCV-3217B - Vent HDR to Containment 24.
HCV-204T, U HPSI Suction RAS Closes 9
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