ML18082A184
| ML18082A184 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/11/1980 |
| From: | Librizzi F Public Service Enterprise Group |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578 NUDOCS 8004170062 | |
| Download: ML18082A184 (6) | |
Text
... I Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /430-7000 Mr. A. Schwencer, Chief Operating R,eactors Branch #1 Apri1 11, 1980 U.S. Nuclear Regulatory Commission Washington, PC 20555
Dear Mr. Schwericer:
ADDITIONAL INFORMATION POST -
IMPLEMENTATION REVIEW TMI LESSONS LEARNED -
J:\\l'UREG-0578 SALEM GENERA.TING STATION NO. 1 UN!T DOCKET NO. 50-272 Attached are revised pa,ges* fo:i; the Ja,nu;a,ry 2, 1980 Lessons Learned s-ubmittal.
'l'h.ese revisions incorpora,te additional in-formation reg:-uested by the NRC a,t the,A,pril 8, 1980 meeting.
Also attached are revised pages that ha;ve been submitted for Salem 2 by 1,etters d.ated M;a,rch 28 and April 3, 1980.
These pages are applicable to Sa,lem l.
CENTENNIAL OF LIGHT (2]
1879 1979 Very truly yo-urs,
- ~11~ -
F.rank P. Librig Genetal M;a,na,get -
Electric Pr6du;ction so o.qiyo o s 2 95-2001 (300M) 1-79 J
_!'owc_:_~~~E.!_y___f_~~--~rc_ssur i zcr Helie f and Block Valves and Pressurizer Level Indicutors
- 1.
Motive and control components of the power-operated relief valves (PORVs) shall be capable of being sup-plied from either the of fsite power source or the e-mergency power source when the offsite power is not available.Motive and control components associated
- 2.
with the PORV block valves shall be capable of being supplied from either the offsite power source or the emergency power source when the offsite power is not available.
- 3.
Motive and control power connections to the emergency buses for the PORVs and their associated block valves shall be through devices that have been qualified in accordance with safety-grade requirements.
- 4.
The pressurizer level indication instrument channels shall be powered from the vital instrument buses.
These buses shall have the capability of being sup-plied from either the offsite power source or the e-mergency power source when offsite power is not available.
RESPONSE
'l'he pressurizer PORVs and their associated block valves are powered from the emergency power sc,.J'l"."CP..
Motive and cont1-0J_
power interfaces with the emergency-power source satisfy safety-grade requirements.
The PORV's are air-operated and the block valves are motor-operated.
The solenoids and motors have been qualified to safety-grade requi~ements.
The design of the pressurizer relief and block valve arrangement for both Salem units was predicted on ensuring the ability to relieve.
This concept resulted in providing two parallel relief paths which are completely independent and redundant.
Such a design concept is necessary to pro-vide protection for A'rws conditions and low temperature overpressure transients.
M P79 54 01/5
-3b-8,1lem 1 & 2
I I
I Incorporation of complete independence between the relief valve and block valve would negate the system's ability to meet the single-failure criterion for the events identif i~d above.
The existing design, however, does incorporate the use of diverse power supplies for the PORV's and their asso-ciated block valves.
The relief valve solenoids are sup-plied by Class IE, 125VDC systems while the block valves use 230V and 115V vital AC.
There is no requirement for provisions to switch from normal power to emergency onsite power for these devices since the normal power supply in all cases is part of the onsite vital power system.
Pressurizer level indication instrument channels are powered from the vital instrument buses.
The instrument air utilized for operation of the PORV's is a safety grade system.
A description of the Instrument Air System is provided in FSAR Section 9.14.2.2.
Two redundant instrument air headers supply motive power for the PORV's.
The normal source of air for the instrument air headers is from the station air compressors (non-vital power).
Two safety-grade emergency control air compressors, powered from separate vital buses, supply air for the redundant instrument air headers.
The PORV's require air to open and fail in the closed position on loss of air.
M p79 54 01/6
-3c-Salem 1 & 2
Tl\\l3LE 2. l. 3. b-1 SUBCOOLING ME'l'ER INFOHMJ\\TIOO Display Information Displayed (T-Tsat, Tsat, Press, etc.)
Display Type (Analog, Digital, CRI')
Continuous or on Demand Single or Redunda:it Display
!£>Cation of Display Alarms (include setpoints)
CNerall uncertainty (°F, PSI)
Range of Display Qualifications (seismic, environmental, IEEE323)
Calculator
'JYpe (process computer, dedicated digital or analog calc. }
If process computer is used specify avail ability. (% of time}
Single or redundant calculators Selection !.Dgic (highest T., lcwest press}
Qualifications (seismic, environmental, IEEE323)
Calculational Technique (Steam Tables, Functional Fit, ranges}
Input Tenperature {RTD's or T/C's)
Tcmpcruturc (ntnnbcr of sensors and locations)
Ran<Jc o( tcrrpcrature sensors
-8.:l-Note 1 CRI' and l\\na_log Pen Hecorder Note 1 Note 2 Note 3 Note 4 Note 5 Note 6 None Process Computer (Note 8) 90%-95% (Estimated)
Single Note 7 None Steam Tables (Note 9) 32<°F<705 12g>sia<3204 Chrornel/Alwnel T/C 65 Incore T/C's 30-2200°1" S;:dem 1 & 2 r
f' ',. '
I 1 ) ' *. ~ *:
L\\ * * ~ i..*.,.l
T/\\BLE 2.1. 3.b-1 (CONTINUED)
Uncertainty* of temperature sensors (°F at 1)
Qualifications (seismic, environmental, IEEE323)
Pressure (specify*instnnnent used)
Pressure (number of sensors and locations)
Range of Pressure sensors Uncertainty* of pressure sensors (PSI at 1)
Olalifications (seismic, environmental, IEEE323)
Backup Capability Availability of Temp & Press Availability of Steam Tables etc.
Training of operators Procedures
+ 5op None Barton 763 2-#11 Hot Leg 0-3000 psig
+/-130 psi (Small Break Conditions)
Qualified, Safety Grade Main Console Indica-tion Conversion Curves COillpleted Completed
- Uncertainties are not affected by differences in RCS flow conditions.
Thermocouples are located in hottest regions and pressure measurement is independent of flew conditions.
Notes
- 1. Continuous information displayed on analog pen recorder:
(Tsat-Tact), (Pact-Psat).
Information available on demand:
(Tsat-Tact),(Pact-Psat), Psat, Pressure.
'lerrperature and location of hottest in-core T/C.
- 2. 'Ihe information available on demand can be displayed on the CRT or trend typewriter.
M P79 5*1 01/14
-m.r:-*
Salem l & 2 1.,,. G
\\;.,
.... \\.I
Notes*
TABLE 2.1. 3. b-1 (CONTINUED)
- 3.
The CHT is located on the center-left portion of the main control console.
The other displays are available at the operator's com-puter console.
4~ Alarms:
(Tsat-1'act) - less than 50°F subcooling (P-Psat) - less than 200 psi Temp. - any T/C greater than 630°F If these alarms occur, they will,he displayed even if the subcooling calculation program has not been requirested by the operator.
- 5. Overall uncertainty is a factor of the uncertainty in the tempera-ture and pressure measurements and the resulting potential error when using the steam tables.
'Ihe uncertainties of these devices are listed separately on the table.
- 6. Analog Ranges:
(Tsat-Tact) 0-120°F Diff; (P-Psat) 0-1000 psi Diff CRI' Range:
N/A
- 7.
'Ihe selection logic used is:
- highest in-core T/C reading
- average of two reactor coolant presst.:res.
The operator is provided with the capability to reject the selected T/C; the next highest reading T/C will then be automatically se-lected for the calculation.
A reasonability check of the two pressure readings is performed by the computer.
If the readings indicate that one of the measurements is invalid, the computer will reject the invalid reading.
- 8. 'Ihe process computer is pa.vered from a vital bus through an inverter with battery backup.
- 9. 'Ihe subcooling calculations are perforrred on an 8-10 second basis
- M P79 54 01/15
-8c-Salem 1 & 2 APR ~ j_ 1980
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