ML051260197
| ML051260197 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 05/26/2005 |
| From: | Michael Webb NRC/NRR/DLPM/LPD4 |
| To: | Schinzel G South Texas |
| Webb M, NRR/DLPM, 415-1347 | |
| Shared Package | |
| ML051600374 | List: |
| References | |
| Download: ML051260197 (4) | |
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l [he!Wb STP Design Cange~ Package Page 1 q Michael Webb
- STP Design Change Package Paie 1 fi From:
Michael Webb To:
Schinzel, Glen Date:
5/26/04 10:00AM
Subject:
STP Design Change Package
- Glen, I have attached comments that were forwarded to me by the staff of the Division of Engineering regarding the South Texas Project Design Change Package you provided to us that described the use of ASCO solenoid operated valves.
After you and your colleagues have had a chance to evaluate them, we can set up a call to discuss them further.
- Thanks, Mike Webb NRC Project Manager for South Texas Project 301-415-1347 CC:
Head, Scott 3
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STP Design Change Package 5/26/04 10:00AM Michael Webb MKW@nrc.gov Recipients nrc.gov owf2_po.OWFNDO DCF BC (David Fischer) nrc.gov owf4_po.OWFNDO MKW BC (Michael Webb)
Action Delivered Date & Time 05/26/04 10:00AM stpegs.com geschinzel (Schinzel, Glen) smhead CC (Head, Scott)
Post Office owf2_po.OWFNDO owf4_po.OWFNDO Delivered Pending 05/26/04 10:00AM Pending Route nrc.gov nrc.gov stpegs.com Files Review lDraft.wpd MESSAGE Options Auto Delete:
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Size 13972 1191 Date & Time 05/26/04 09:56AM 05/26/04 10:00AM No None Yes Standard No None No Standard Immediate Delivered & Opened
May 24, 2004
Subject:
REPLACEMENT OF SAFETY-RELATED SOLENOID OPERATED VALVES WITH COMMERCIAL-GRADE SOLENOID OPERATED VALVES7XT SOUTH TEXAS PROJECT t\\/i By letter dated May 12, 2004, South Texas Project Nuclear;Operating1Company,(STPNOC) forwarded to the NRC Staff Design Change Package #61 019793-10 Piopri diry) and A/
Document Change Notice #JD-885 (Proprietary). Both ducuments related edothfe puicas-e'of commercial-grade ASCO solenoid valves (Catalog Number2 2-2633-1 RVF) as'replaceme~nts for certain low safety significant (LSS) safety-related seisrrtc category 1 ASCO solenoid -valves (Catalog Number 206-381-6RF) as allowed by STPNOC's approVed multi-part exemption request.
According to the Design Change Package, the replacement solenoid operated valves (SOVs) will be located in the Turbine Generator Building (TGB)P'The
'at South Texas Project (STP) is considered to be a harsh environre.t because it has an abnormal temperature of 1470F (upon loss of TGB HVAC for 24-ho6rs oncet'each year).sThe TGB normal temperature is 1100F. The commercial-grade SOV 21'2-633-RVFpis temperature rated for continuous operation at 1250F ambient air and I86OFprocess fluid. According to the Design Change Package, an ASCO engineer statedytt 212-633-1 RVF SOVs will operate in a temperature environment up to 1600F. two NRC staff review of these t curents ndthat STPNOC performed a reasonabe evaluatiojVof the environmental and seis' r pability of the replacement SOVs. However, the staff noted the following points:
- 1.
The 212-633-1 nercigrade SOVs are not qualified for use in the containrment enviro ment.The licensee needs to ensure that these SOVs are not used as rep, _7cements for'SOVs located inside containment or in other locations where the environment might exceed their design capability.
- 2.
1The 212-633-1 RVF1co'r'mmercial-grade SOVs purchased by STPNOC have solenoids
.E with waterproofhorclo'sures and the non-metalic parts inside the valves (e.g., seats and
' gaskets) are m ade of heat-resistant Viton. ASCO manufactures the same model
' X number SOVavith non-waterproof enclosures and with less heat-resistant Buna UN"
- seats and-iskets. STPNOC needs to ensure that only SOVs with waterproof en ilosure'sand Viton elastomers are used in the TGB.
- 3.
~Commercial-grade SOVs manufactured by ASCO are not subject to the same quality controls as their safety-related SOVs. ASCO can substitute or replace materials and parts on their commercial grade SOVs without documenting the change and without changing the catalog number. The licensee needs to ensure that any purchased commercial grade SOVs are configured as represented in the Design Change Package.
--v
- 4.
The ASCO engineer referenced in the Design Change Package stated that maintaining the current preventive maintenance frequency that is applied to the 206-381-6RF (safety-related) SOV would be appropriate since the aging is related to temperature and the two valves are similar (presumably replacing the valves every 13 years). STPNOC will need to ensure that the LSS SOVs are adequately maintained (i.e., consistent with the vendor recommendation documented in the Design Change Package).
A
- 5.
The Design Change Package does not address system performance attribufes of the original and replacement SOVs. For example, the Design Chan'ge Pac'Kage does not discuss the significance of the difference in flow coefficients.
We plan to discuss these points with the licensee during (telephone 1r1!erence call. We wil give the senior resident inspector and the Region the opportunity pain the c Staff reviewers:
David Fischer, EMEB 415 2728 X
7 Thomas Scarbrough, EMEB 415'-27 John Fair, EMEB 415-2759 Paul Shemanski, EEIB 415-2766 ;'/
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