ML19098B431
| ML19098B431 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 05/20/1977 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | Case E, Reid R Office of Nuclear Reactor Regulation |
| References | |
| Serial No. 146/032877 | |
| Download: ML19098B431 (4) | |
Text
e VIRGINIA ELECTRIC AND POWER COMPANY RIOHMOND,VIRGINIA 23261 May 20, 1977,.
Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation
- u. s. Nuclear Regulatory Commission Washington, D. C. 20555 License Nos. DPR-32 Attn: Mr. Robert W. Reid, Chief Operating Reactors Branch
Dear Mr. Case:
(l;Uij11Rl _~Ot~[ Htt't!WJ This is in response to your request for a review of our diesel generator alarm and control circuitry. The review has been completed with all aspects of possible diesel generator operational conditions considered. The answers to your questions (a), (b) and (c) are contained in the attachment.
As shown in the attachment, there are three main annunciators per diesel generator in the control room. In the event of a diesel generator problem, the NRG licensed control room operator is capable of interpreting the information available. Another operation's person is then dispatched to the diesel generator to further discern the problem and to report back to the control room so that corrective action may be properly started.
Therefore, the present annunciation of diesel generator problems is adequate.
Questions (d) and (e) are answered below:
In response to question (d), there is no condition that would render the diesel incapable of responding to an emergency start signal which is not alarmed in the control room.
I In response to question (e), as no deficiencies were found in either the alarm or the control circuitry of the diesel generators, there are no proposed modifications.
- yours, Attachment cc: Mr. Norman C. Moseley
e A'ITACHMENT TO LETI'ER ON DIESEL GENERA'IDR AI.ARMS AND CONTROL CIRCUITRY STUDY SERIAL 146/032877
- The answers to questions (a),* (b) and (c) follCM:
Question (a) - All conditions that render the diesel generator incapable of responding to an autc:matic-ernergency start signal.
Response (a)
- 1)
- 2)
- 3)
- 4)
Condition Diesel generator output differential current fault Diesel generator output current high No diesel generator field Overspeed The four above conditions must be reset prior to any start.
- 5)
Manual stop fran local or remote locations This condition and its subsequent alarm answers your state-nent, "One area of particular concern is the unreset con-dition following a manual stop at the local station which terminates a diesel generator test prior to resetting the diesel generator controls for.enabling subsequent automatic operation."
- 6)
Control Roan switch in "EXERCISE" instead of "AUI'O"
- 7)
- 8)
- 9)
- 10)
- 11)
Engine Control Cabinet (at the diesel) Switch in "LOCAL ST.ARI'"
Necessary circuit breakers in "OFF" position (Exciter - AC Control - DC Control -
both Start 1 and Start 2) 1.£1.N starting air pressure Less than required fuel inventory I.£M battery voltage Control Room Alarm Lccation 1J55 1J55 1J63 & lBl 1J63 & lBl lBl 1J63 1J63 1J63 1J63 1J63 1J63 & 1K47 Question (b) - The wording on the annunciator window in the control roan that is alarmed for each of the conditions identified in (a).
I
Response (b) -
.e Control Room Alarm LOcation 1J55 1J63
]Bl l.K47 e
Attachment
- Wording on Alarm EMER. GEN. 1 DIFFERENTIAL EMER. GEN. 1 TROUBLE EMERGENCY DIESEL NO. 1 AUX. 'IRIP REIAY ACTUATED RZ\\.TI'ERY W VOLTAGE Qnestion (c) - Any other ala..l'.Til signals that also cause the same annunciator to alarm Response (c)
Alarm 1J55
]Bl
!Jb.:S l.K47 Condition to Alann other than stated in response (a}
-c~t.*-1* c;:--S-t_==rt_ C':i-~("lli ~-brP;:J~P.:t"--in----!1.QE'F-
-. OtJ,-, pres!:>ure low while di~sel is. running
- lube _oil temperature low jvhil$ diesel is not* iunni.rlg *
-
- crankcase pressure *high
- .... '* la,;, water pressure engine hot
- 1ube oil level l<:M'
-
- fuel filter pressure high air ccrnpressor No. 1 or No. 2 Switch in "OFF" one second after emergency start signal received and proper relays haven't energized diesel has not reached 40 rµn in 3 sec.
after start signal received diesel has not reached 100 rpm in 4 sec.
after start signal received within one second after the diesel has
.reached 870 rpn, the generator breaker has not closed, within 12 minutes after stop signal is received, the proper relays have not reset lav voltage in either station battery 1
Rf C!:IVED DOCUMENT PfWCEE:,SINC; Will 19/l MAY 26 AM 9 45
,.,