ML19031A657
| ML19031A657 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 05/31/1977 |
| From: | Librizzi F Public Service Electric & Gas Co |
| To: | Lear G Office of Nuclear Reactor Regulation |
| References | |
| Download: ML19031A657 (15) | |
Text
Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201/622-7000
\\Rleguf atory Docket f':lt~
May 31, 1977 Director of Nuclear Reactor Regulation
- u. S. Nuclear Regulatory Comm1ssion 7920 Norfolk Avenue Bethesda, Maryland 20014 Attention:
Mr. George Lear, Chief Operating Reactor, Branch #3 Division of Operating Reactors
Dear Mr. Lear:
SALEM GENERATING STATION -
UNIT NO. 1 DIESEL GENERATOR ALARM AND CONTROL CIRCUITING LICENSE NO. DPR-70 DOCKET NO. 50-272 We have reviewed the alarm and control circuitry for the diesel generators at Salem Unit 1 as requested in your letter of March 28.
Attached is an analysis prepared by our Engineering and Construction Department of the alarms available to the control room operator concerning the operability of a diesel
. generator.
We have concluded from this analysis that sufficient information is available to the control room operator for him to know when a diesel generator is inoperable.
In the area of your particular concern, an unreset condition.following a manual operation at a local station, we had already initiated a change that will not lock out the automatic start feature in the event the diesel-
. generator is manually operated.
Should you wish additional information, please do not hesitate to contact us.
The Energy People Very truly yours,
~
Frank P.~"}i General Manager -
Electric Production 95*2001 300M 8-75
f SALEM NUCLEAR GENE~ING STATION NO~ 1 UNIT INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL-GENERATORS An analysis has been made of the diesel-generator control circuits, system interlocks and alarm circuitry in order to determine the alarms available to the control room operator concerning the oper-ability of the diesel-generators.
Numerous local indications and alarms are available to determine the status and operating conditions of the diesel-generators.
The alarms and a description of the diesel-generators are presented in the FSAR section 8.4 and in the response to question 8.8.
The control room operator is provided with indication and alarms for the status of the diesel-generators, trip conditions, operating parameters re-quiring immediate.attention and an alarm whenever a local alarm occurs.
Further, the manual operation of the diesel-generators is under the administrative control of the operators to assure that they are made aware of any operation, test, maintenance or repair activity which affects the diesel-generators.
This analysis examines conditions which would render the diesel-generators incapable of responding to an emergency start condition and the indications avail-able to the operator during such conditions.
The results of the analysis are presented in tabular form showing the disabling condition, whether or not the condition is alarmed and the title of the particular alarm.
The analysis was performed on the lA Diesel-Generator.
lB and lC Diesel-Generators would be similar.
Question (a)
The conditions which render the diesel-generators incapable of responding to an automatic emergency start. signal are shown in the table presenting the results of our analysis.
Question (b)
The wording of the alarms for the conditions of Question (a) are also shown in the table presenting the results of our an~lysis.
,.~..
- --1)'
t.* Question (c)
Only four alarms shown in the table are annunciated by other alarm signals besides the disabling condition shown~ The alarms are noted in the table with an explanation showing all alarm signals which will generate that particular alarm.
Question (d)
All conditions which could render the diesel-generators incapable of responding to an automatic emergency start signal are made known to the control room operator through administrative procedures and alarms.
Only two instances exist where a direct alarm is not provided to warn the operator of a disabling condition, however, both functions are under administrative control. These are described below:
- 1. The Diesel-Generator Breaker Control Switch (BCS) is under administrative control. The BCS switch "pull to lock out feature requires a deliberate action on the part of an operator. The
~ontrol room operator is made aware of the fact that the switch is in the lock out position and its subsequent effects on diesel-generator operation through administrative procedures.
Earlier this year it was determined that the "pull to lock out" feature
- was not needed for any diesel ~enerator function or condition..
The BCS switch is in the process of being replaced by a spring return.switch which will eliminate the maintained lockout iunction.
When the switch is replaced it will not prevent the diesel-generator from responding to an. emergency start signal.
- 2.
The relay test switches are under administrative control. All testing and maintenance is performed under procedures which require a record of equipment out of service and unavailable.
The operator is aware of such information and the fact that the diesel-generators are out of service.
All other conditions are alanned in the control room.
Administrative procedures require the~operator to investigate and determi_1_1e_ the cause of each alann condition.
The administrative procedures and alanns assure that the control room operator is aware of diesel-generator status.
Question (e)
We do not propose any modifications resulting from this evaluation. The operator has sufficient infonnation available to him in the control room through alarms and administrative procedures for monitoring diesel-.
generator operation and status.
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SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS DISABLING CONDITION lA Diesel - Generator Lockout Switch (LS) in "on" (locked out}
position lA Diesel -
Generator Regulator Manual Auto Switch (RMAS) in "man,ual" position Loss of 125V DC Control Power for lA biesel-Gener ator Engine Con-trol and Generator Control Cabinet Circuits EFFECTS ALARM interlock with 6Yes start circuitry which will pre-vent emergency start of diesel-gener ator Lose Control Circuitry and Prevent Emer-gency Start of Diesel -
Generator*
Yes Yes Yes TYPE Auxiliary Annunciator Control Con-sole Control Con-sole Auxiliary Annunciator Auxiliary Annunicator TERMINOLOGY "lA Diesel-Generator Locked Out 11 Diesel Gener-ator -
lA "Lockout" Diesel Gener-ator -
lA "Diesel Trou-ble" Alarm (See note 2)
"lA Diesel Generator Exciter Reg-ulator in Manual" "lA Diesel Generator Generator Field toss of 125V DC 11 Yes Control Con-
-Diesel G~ner-sole ator-lA "Diesel Trou-ble 11 Alarm (See Note 2)
DISABLING CONDITION
.SALEM NUCLEAR GENERATING.STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS EFFECTS Lose Exciter Circuitry Lose Trip and Voltage Relay Circuitry and Prevent Clos-ure of Diesel Generator Breaker lADD ALARM Yes Yes TYPE Auxiliary Annunciator Auxiliary Annunciator TERMINOLOGY "lA Diesel Generator Generator Field Loss of 125V DC" "lA Diesel Generator Unit Trips Loss of 125V bC" Yes Control Con-Diesel Gener-sole ator-lA "Diesel Trou-ble (See note
- 2)
SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS DISABLING CONDITION Loss of lA Diesel-Gener ator Starting Air Loss of *fuel oil for lA Diesel-Generator EFFECTS ALARM Lack of Starting Yes Air Will Prevent
- The Diesel From Starting Lack of fuel oil will prevent diesel from starting Yes Yes Yes TYPE Overhead Annunciator Control Con-sole
-Overhead Annunciator Control Con-sole TERMINOLOGY "Diesel Gen-erator lA.
Urgent Trou-ble" (See note 1)
Diesel Gener-ator-IA "Diesel Trou-ble Alarm (See Note 2)
Redundant star ting air.
systems are provided for each diesel generator, low pressure in either air receiver will initiate alarm.
"lA, lB, lC Fuel Oil Day Tank Level
- Tr.ouble" (See note 3)
Diesel Gener-ator-IA "Diesel Trou-ble" Alarm (See Note 2)
SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL. GENERATORS DISABLING CONDITION Loss of 125V DC Control power for lA Vital Bus Infeed Breaker llASD EFFECTS ALARM Breaker llASD Yes will not open thereby prevent-ing closure of diesel breaker lADD TYPE Auxiliary Annunciator TERMINOLOGY "lA 4 kV Vital Bus Feeder Circuit Breaker 12ASD Loss of 125V DC"
DISABLING CONDITION Operation of the lA 4 kV Vital Bus Differential Pro-tection Relay Operation of the lA Vital Bus Over-current Protection Relay Loss of 125V DC Control Power for lA Diesel Breaker lADD SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS EFFEC'rS Interlocks with diesel breaker lADD control and will prevent breaker closure Interlocks with diesel breaker lADD control and will prevent breaker closure.
Prevents closure of diesel breaker lADD ALARM Yes Yes Yes TYPE Overhead Annunciator Overhead Annunciator Auxiliary Annunciator TERMINOLOGY "4 kV Vital Bus lA Dif-ferential Protection" "4 kV Vital Bus lA Over-load" "lA Diesel Generator 4kV Feeder Circuit Breaker lADD Loss of 125V DC"
DISABLING CONDITION Operation of lA Diesel Generator Diesel Unit Trip Relay (DUTR)
- SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS EFFEC'rS Interlock with start circuitry which will prevent emergency start of diesel-gener-ator ALARM Yes Yes TYPE Auxiliary Annunciator TERMINOLOGY "lA Diesel Generator Engine/Gen-erator Tripped Control Con-Diesel Gen-sole erator -
lA "Diesel Gen-er a tor Emer-gency Trip 11 Control Con-sole Diesel Gen-er a tor-IA.
"Diesel Trou-ble11 Alarm (See note 2)
SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS DISABLING CONDITION Loss of 115V control power *to lA Safe-guards Equipment Control System (SEC)
Internal Failure of lA Safeguards Equip-ment ~ontrol system Relay test switches for lA Diesel Gen-er a tor EFFECTS ALARM Emergency Yes start signal will not be given to diesel generators Prevents Yes initiation of diesel-generator start signal depending on failure con-dition Test operation of relay switches would prevent start or diesel loading TYPE Auxiliary Annunciator Overhead Annunciator Auxiliary Annunciator Overhead Annunciator TERMINOLOGY "lA Safeguard Emergency Cabinet Loss of Control Voltage" "SEC cabinets lA, lB or lC Test/Trouble" (See* Note 4) lA safeguard emergency cabinet loss of control voltage" "SEC cabinets lA, lB or lC Test/Trouble"
{See Note 4)
All Relay Test Switches are under Administrative Control
r*.
SALEM NUCLEAR GENERATING STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS DISABLING CONDITION DS 15 (DUTR)
DS 8 (Diesel Voltage Sensing) 24-86B-2 (lA Vital Bus Overload) 24-86BD-2 (lA Vital Bus Diff) lA Diesel Breaker Control Switch (BCS) in pull to lock out trip position NOTE:
Condition will be removed following installation of spring return switch.
Work is scheduled for Sept.
1977 Unit Outage.
EFFECTS Prevent start Prevent closure of lA diesel breaker Prevent closure of lA diesel breaker Prevent closure of lA diesel breaker Maintains trip signal for diesel breaker lADD but is blocked from.
operation during emergency start of diesel by ALARM TYPE 8 -
TERMINOLOGY Test switch supervision light in con-trol room Test switch supervision light in control room Test switch supervision light in control room The BCS is under Admin-istrative Control
DISABLING CONDITION Operation of lA diesel breaker trip relay (DETR) 6Rl 41/57 e
e SALEM NUCLEAR GENERATING.STATION UNIT 1 INDICATION OF THE OPERATIONAL STATUS OF THE DIESEL GENERATORS EFFECTS safeguards equipment control system (SEC) ; once loading se-quence com-pleted and SEC reset, breaker lADD will be tripped ALARM Maintains trip Yes signal for diesel breaker lADD; as soon as breaker closes breaker lADD will be tripped 9 -
TYPE Control Console TERMINOLOGY Diesel Genera
-t;.or-lA "Diese.lJ Trouble" Alarrq (See Note 2)
DIESEL GENERATING OPERATING STATUS INDICATION ANALYSIS NOTE 1:
The lA Diesel Generator Urgent Trouble Alarm is caused by a number of alarmed conditions which are as follows:
NOTE 2:
NOTE 3:
NOTE4:
low starting air pressure high jacket water temperatu~e low lube oil pressure high lube oil temperature pre-lube oil pump failure engine overcrank generator ground fault The Diesel Trouble Alarm occurs. whenever a local alarm is initiated.
The local alarms are listed in the response to FSAR Question 8.8.
A description of the control room alarm circuitry is described in the response to FSAR Question 7.7.
The lA, lB, lC Fuel Oil Day Tank Level Trouble Alarm is initiated whenever* low level occurs in either lA, lB or lC diesel generator fuel oil tanks.
The SEC Cabinets lA, lB or lC Test/Trouble Alarm will occur if any of the three SEC cabinets develop prbblems.
GENERAL: A description of the Control Room al~rm circuitry is des-cribed in the response to FSAR Question 7.7..
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