ML16340D190
| ML16340D190 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/23/1983 |
| From: | Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Ahearne J, Gilinsky V, Palladino N NRC COMMISSION (OCM) |
| Shared Package | |
| ML16340D191 | List: |
| References | |
| NUDOCS 8303030382 | |
| Download: ML16340D190 (14) | |
Text
tIENORANDUII FOR:
Chairman Pal ladino Commissioner Gilinsky Commissioner Ahearne Commissioner Rober ts Comnissioner Asselstine FROtii.'UBJECT:
William J. Dircks Executive Director for Operations STATUS OF DIABLO CANYON DESIGN VERIFICATION PROGRAtl Per your request, attached is a status sunmary of the evaluation efforts in progress for Diablo Canyon by PGM, the IDVP and the staff.
The critical element in completing the activities required for a Comoission decision regarding fuel load authorization (Step 1 of the 3-step approved licensing process) is the design verification of the containment annulus steel structure and the necessary modifications to the structure.
PGGE is continuing the analysis and discussion with the IDVP is required r e-garding the adequacy of proposed modifications.
The results of the recently completed horizontal analysis of the annulus structure by BNL were presented to PGIj'E and the IDVP in a meeting on February 15, 1903.
The final resolution will require the interaction of PGEE, the IDVP and the staff (ih>conjunction with BNL).
{$jgMNglljjam J. Dircjis
Enclosure:
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PE QC William J, Dircks Executive Director for Operations
Contact:
H. Schierling, DL/NRR OFFICE/
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Diablo Canyon Design Verification Program Status Report - February 18, 1983 I.
Overview Diablo Canyon review has been proceeding along the approach disussed
>>ith the Commission in December.
Our recent letter, dated February 17, 1983, to Rep. Udall addresses several pertinent features of that approach (see Enclosure 1).
The schedule has also been proceeding generally along that set forth in the PGRE December 2 submittal (copy attached to Enclosure
- 1) although PGEE/IOVP efforts appear slightly behind schedule.
PGE~E and IOVP evaluation efforts are approximately 2/3 complete for Phase I and 1/3 complete for Phase II activities.
The staff review is proceeding and its efforts, including BNL review, are following and supporting the PGE/IOVP schedules.
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I3 II.
PGEE Efforts PG&E Semi-honthly Report 31 (February ll, 1983) provides sugary information on the IDVP and on the PGSE Internal Technical Program (ITP).
The ITP has identified to date 36 Open Items (OI), two of which occurred in the last reporting period (OI 35 - Deficiencies in STRUDL II Computer Program; OI 36-Discrepancies in Heat Loads for HVAC Design).
These open items are comparable to the EOIs of the IDVP.
Open Item 34, identified by PGSE in December
- 1982, identified the potential that the component cooling water system under certain assumed failure modes, may not meet the licensing criteria.
(This issue is also.discussed below under staff activities).
The ITP is continuing its confirmatory analysis of the annulus steel structure.
The status of the effort was discussed with the IDVP at a meeting on February 4, 1983.
PGSE is evaluating the results of the analysis. in light of the IDVP comments made during the meeting with respect to potential modifications to the steel structure.
Another meeting on the subject is scheduled for late February.
These structural modifications would result in floor response spectra (accelerations as function of frequency) which are within the FSAR envelope design spectra.
PGSE will address their annulus steel structure analysis results in the next amendment to the Phase I Final Report (Eight additions/
amendments to this report have been made to date).
PGSE estimated at the end of January that the analysis and engineering design effort for Phase I and Phase II has been about 2/3 completed and the modifica-
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ti'ons for both Phases are about 1/3 completed,
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III.
Independent Desi n Verification Pro ram IOVP)
The IDVP semi-monthly report for January 1983 (January 28, 1983) provides the following information regarding issues that have been identified as EOIs (error or open item) and for which a file has been opened:
Total Errors Non-Errors Phase I
194 17 177 Phase II Construction QA, 70 22 48 Resolution Resolved by IDVP Evaluation Continuing 164 30 67 18 AS of February 17,
- 1983, 32 Interim Technical Reports (ITR) have been issued by the IDVP, of which 17 pertain to Phase I activities and 15 to Phase II activities'.
A listing of all ITRs issued is provided in Enclosure 2.
Many of'the Phase II ITRs require a revision as a result of meetings between the IDVP and the PGEE Diablo Canyon Project at which the Project provided further clarification and information on issues identified in these Its.
T)ese meetings also provided clarification regarding potential Phase II additional verification and additional sampling that had been identified in Draft ITR-224 of December 23, 1983.
At this time, the IOVP has preliminarily identified the need for the following additional verification work for Phase II:
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Evaluation of redundancy of equipment for shared systems between Unit 1
and Unit 2, 2.
Evaluating the design temperature and pressure for two additional safety-related systems (component cooling water and main steam system),
- 3. 'nalysis of jet impingement effects inside containment, f
4.
Evaluation of environmental consequences of postulated pipe
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ruptures outside containment.
The IDVP review of the Brookhaven Report on the vertical seismic analysis of the annulus steel structure, as requested by NRR, is in progress.
Additional information provided by BNL
.on this subject is being reviewed by the IDVP and an ITR on the subject is expected.
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IV.
NRC Effort The staff met with PGSE on January 13, 1983 to discuss the overall status of the design verification effort.
At that meeting PGSE informed the staff that the schedules outlined in their letter of December 2 remains current and achievable.
(NRC fuel load decision required by March 31).
A transcript of that meeting, open to the public, was provided to all parties.
The staff has been informally notifi'ed by PG&E that, while efforts are a few weeks behind
- schedule, they are attempting to hold the December 2 schedule.
On January 25, 1983 BNL briefed the staff on the status of their studies and on February 15, 1983 the same information was discussed in a meeting which was also attended by the I'DVP and PGSE.
The additional BNL studies on a
buried tank and on two additional piping problems are in progress and are expected to be completed in about one month.
The BNL horizontal seismic analysis of the annulus steel structure has been completed.
The analysis shows that torsional effects in the horizontal plane exist and some localized motions can si'gnificantly contribute to the overall response.
The staff is evaluating these findings.
The BNL analysi's.
was based on information provided by PGSE up through early January and may not necessarily account for recent modifications to the structure.
As a result of the review by the IDVP of the pressure and temperature environment for safety-related equipment outside containment, as presented in I'TR 14, the staff initiated a review of this subject.
PGSE was requested and provided the necessary detailed information for a calculation with the staff computer qode currently in use.
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In a related matter, in early January, allegations were made to the staff regarding the design adequacy and performance of the Diablo Canyon Unit 1
component cooling water (CCl<) system and several other related concerns.
The alleger has requested to remain anonymous and the staff is attempting to honor that request.
The allegations were the subject of'oard Notifications.
HRR subsequently informed the IDVP of those allegations.
The staff met with PGEE on January 28, 1983 to discuss these concerns.
The meeting was open to the Public.
PGGE provided clarification on the design bases and functional performance of the CCH system.
The staff currently is re-evaluating the issue in light of the additional infor-mation and our review efforts are targeted for completion by early April.
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