ML042960342
| ML042960342 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 06/25/2004 |
| From: | Straka D Arizona Public Service Co |
| To: | Gody A Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0307 | |
| Download: ML042960342 (2) | |
Text
From:
<DSTRAKA@apNc.c9M> 4 r2t Ko To:
<atg~nrc.gov>W<rha od Date:
6/25/04 11:51AM
Subject:
Please pass to Chuck Paulk.
SBCS configuration and Modifications, installation dates shown in RED month/year.
- Regards, Don Straka Senior Consultant - Regulatory Affairs dstraka@apsc.com phone: 623.393.5041 pager: 602.509.6240 mobile: 602.509.6240
> -Original Message--
> From:
Barbera, Steven J(Z99626)
> Sent:
Thursday, June 24, 2004 3:52 PM
> To:
Straka, Donald J(Z99942); Hypse, Mark L(V53307); Anderson, Gary
> T(Z02256)
> Cc: Hodge, Michael F(Z48290); Taylor, James T(Z94098)
Subject:
> Don,
- > I am assuming you are talking about NNND1I and NNNDI2 when you are
> talking about SBC power.
> 1. The NORMAL power source at NNNDII (D12) has always been from NHNM13
> (Ml 0) and the EMERGENCY from PHAM31 (M32). At one time there was
> confusion as to which source was more reliable and the units were
> aligning the panels differently. Some were units had the ABT aligned
> to the Emergency source while others were aligned to the Normal. After
> the "Ring-Tailed cat" event in Unit 1 we decided to replace the
> switches and to align them to the Normal source since PVNGS had
> experienced several loss of off-site power events to either S05 or
> S06.
> 2. The sources remained the same but the alignment changed. The Normal
> source was now the preferred source and the Emergency was the back-up.
> This change came out of the ring-tailed cat event in Unit 1.
> 3. All the NNND1I and D12 switches have been replaced under DMWO
> 740601.
> 1 ENNNDI1 DIWO 740602 03/98
> 1ENNND12 DIWO 740603 03/98
> 2ENNND11 DIWO 740604 09/97
- 2ENNND12 DIWO 740605 09/97
- 3ENNND1 I DIWO 740606 03/97
- 3ENNND12 DIWO 740607 03/97
> -Original Message----
> From:
Straka, Donald J(Z99942)
> Sent:
Thursday, June 24, 2004 12:52 PM
> To: Hypse, Mark L(V53307); Anderson, Gary T(Z02256); Barbera, Steven
> J(Z99626)
> Cc: Hodge, Michael F(Z48290); Taylor, James T(Z94098)
Subject:
AIT RFls from Paulk
> 1. In the original (initial) plant configuration what were the power
> sources for Steam Bypass Control for the preferred (non-vital) power
> to alternate, and was the alternate power source vital (class) or
> another non-vital bus?
> 2. Under the Plant mod, the SBCS was changed from ABTs to static
> switches, were the power sources for the preferred and the alternate
> changed as well?
> 3. Are all three Units SBCS configurations the same, provided dates
> when the SBCS ABTs/static switches were installed in all three units?
> Regards,
> Don Straka
> Senior Consultant - Regulatory Affairs
> dstraka~apsc.com
> phone: 623.393.5041
> pager: 602.509.6240
> mobile: 602.509.6240 CC:
<MHODGE@apsc.com>, <SBARBEO1@apsc.com>, <MHYPSE@apsc.com>