ML20197F676
| ML20197F676 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/17/1981 |
| From: | Fliegel M Office of Nuclear Reactor Regulation |
| To: | Lear G Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20197F583 | List: |
| References | |
| FOIA-86-679 NUDOCS 8112020339 | |
| Download: ML20197F676 (2) | |
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s!EP' ** , 3 Docket tios. 50-275/323 f1EMORAtlDU!! FOR: George Lear, Chief ' /)-
flydrologic and Geotechnical Engineering Cranch Division of Engineering FRO *1: !!yron Fliegel, Leader liydrologic Engineering Section Hydrologic and Geotechnical Engineering Cranch Division of Engineering SU3 JECT: SITE VISIT TO PliYSICAL MODEL OF DIABLO CNiYOf! CREAKHATER Plant !1ane: Diablo Canyon !!uclear Powe- Station, Units 1 and 2 Licensing Stage: OL On November 9 and 10,1981 I visited the physical model of the Diablo Canyon breakwater and surrounding coastal area. I was accompanied by Dr. Robert Sorensen of the U.S. Anay Corps of Engineers Coastal Engineering Research Center (CERC), our consultant, The physical model is located in Escondido, California. It was constructed and is operated by Offshore Technology Corporation for the applicant, Pacific Gas & Electric (PGSE).
The nodel was constructed for the purpose of evaluating the performance of the breakwater that protects the intake cove. In particular, its effectiveness in protecting the power plant intake in the event of severe wave runup was to be evaluated. The physical model is built on a 1 to 45 scale. This scale is also used for the area, both shoreward (to the +40 foot level) and seaward (to the
-100 ft level), of the Diablo Canyon intake cove. Actual bathymetric and topographic features are accurately represented in the model.
At the time I observed it, the breakwater was represented in the model in an assumed, extreme degraded condition. The model is capable of representing various stillwater levels from below Hean Lower Low Water (f1LLW) to above the level of high tide plus an assumed tsunami. In addition, wave mkking machines are used to produce short period waves approaching from various seaward directions. On the two days I observed the model, the wave making machines were set up to produce waves approaching the shore from the south. Previous l
tests showed that this was the most critical direction for incoming waves. On Iovember 9. I observed several test runs of the model with the stillwater level representing Mean Higher High flater (MHHW) with incoming surface short period waves. On flovember 10 the tests I observed were those representing incoming i short period waves superimposed on water level representing til!!!L plus a tsunami.
I The tests were performed as demonstrations primarily for myself and the consultant.
Dr. Sorenson, as recorded tests had previously been run.
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George Lear ,
In addition to observing the model and its tests, on !!ovember 9,1931 I participated, with iny consultant Dr. Sorenson, in a meeting with repre-sentatives of PGSE and their consultants. They presented some prelimi ary results and conclusions based on the tests. We discussed these results and conclusions and how PGAE would.present them to us in a submittal.
Among the important test results and conclusions are the following:
- 1. Have heights observed in front of the intake structure were limited by
, the water depth; is, the wave height in front of the intake did not increase with increasing offshore wave height. Instead the waves approached a maximum height that was dependent upon the wave period.
- 2. The most critical direction of wave approach is from the south.
- 3. For both the case of the extreme wave height at high tide and the case of mean annual wave at high tide plus the tsunami, the air intake at elevation
~ +30 ft !!LLW would be subject to wave action and possible inundation if the breakwater were in an assumed degraded state of being slumped to MLLU level.
- 4. Dynamic wave forces on the intake structure and the air intate towers would be below design levels during these events and with the breakwater degraded to f1LLW.
In view of the above, especially item number 3. PG&E is considering raising the design level of the air intake for pumps (the level at which the safety related components are open to the air), from +30 ft !!LLW to approximately
+52 feet MLLN. This will be accomplished by scaling the air vents in the two towers and constructing cylindrical extensions up to approximately +52 ft MLLW. PGaE will submit a report of their analysis, conclusions, and proposals for NRC review. They hope to have a draft of this report before Thanksgiving.
Original Signed by Myron H. F1i m '
Myron Fliegel, Leader flydrologic Engineering Section Hydrologic and Geotechnical Engineering Branch Division of Engineering cc: R. Vollmer J. Knight B. Buckley M. Fliegel
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November 27, 1981 Docket Nos. 50-275 .
and 50-323 '
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MEMORAllDUf t FOR: Darrell G. Eisenhut, Director- .
Division of Licensing -
FROM: Robert L. Tedesco, Assistant Director for Licensing Division of Licensing
SUBJECT:
PROPOSED BOARD NOTIFICATION OF RECENT ADDITIONAL DAPAGE TO DIABLO CANYON BREAt31ATER I recommend that the enclosed Board Notification be transmitted to the Diablo Canyon, Units 1 & 2, Atomic Safety and Licensing Board.
Original Signed by Robert b Tedescq Robert L. Tedesco, Assistant Director for Licensing Division of Licensing.
DISTRIBUTION:
Docket File 50-275/323 RLTedesco FJMiraglia
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BOARD NOTIFICATION DISTRIBUTION BREAKWATER DAMAGE, DIABLO CANYON, UNITS 1&2 (BN-Sl 44 ) ,.
Atomic Safety and Licensing Appeal Board .
Atomic Safety and Licensing Board Panel Docketing and Service Section Mrs. Elizabeth Apfelberg Andrew Baldwin, Esq.
Richard E. Blankenburg Elizabeth S. Bowers, Esq.
Mr. Glenn 0. Bright Herbert H. Brown, Esq.
Dr. John H. Buck -
Philip A. Crane, Jr., Esq.
Mr. Frderick Eissler David S. Fleischaker, Esq.
Mrs. Raye Fleming Arthur C. Gehr, Esq. , . _
Bryon S'. Georgiou~
Mr. Richard B. Hubbard Dr. W. Reed Johnson Marion P. Johnston, Esq.
- Janice E. Kerr, Esq.
Dr. Jerry Kline Mr. Jchn Marrs Thcras 5. Moore Marjerie S. Nordlinger Bruce Norton, Esq.
John R. Phillips, Esq.
Richard S. Salzman, Esq.
Mr. Ja. mas 0. Schuyler Mr. Gordon Silver . ~
Mrs. Sandra A. Silver Harry M. Willis Mr. Roger Smith Mr. Myer Bender Dr. Max W. Carbon Mr. Jesse C. Ebersole Mr. Harold Etherington Dr. William Kerr
- Dr. Stephen Lawroski Dr. Harold W. Lewis Dr. J. Carson Mark Mr. William M. Mathis Dr. Dade W. Moeller Dr. David Okrent Dr. Milton S. Plesset -
Mr. Jeremiah J. Ray ..
Dr. Paul G. Shewmon Dr. Chester P. Siess a
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o,, UNITED STATES 3 o NUCLEAR REGULATORY COMMISSION h t- WASHINGTON. D. C. 20555
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NOV 3 01981 Docket Nos. 50-275 -
and 50-323 MEMORANDUM FOR: The Atomic Safety and Licensing Board for the Diablo Canyon Nuclear Power Plant, Units 1 & 2 FR0ft: Robert L. Tedesco, Assistant Director for Licensing Division of Licensing -
SUBJECT:
BOARD NOTIFICATION - BREAKWATER DAMAGE, DIABLO CANYON, UNITS 1 & 2 (BN 81 44 )
In accordance with present NRC procedures for Board Notifications, the enclosed information is being provided for your information.
J J Robert L. Tedesco, Assistant Director for Licensing Division of Licensing
Enclosure:
PT-V-81-66 dat'ed Novem ter 16, 1981 cc: See next page 8
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'RELIMINARY NOTIFICATION OF EVENT OR UtiUSUAL OCCURRENCE--PHO-V-81-66 DATE:ll 8 i
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'his preliminary notification constitutes EARLY notice of events of POSSIBLE safety'.or public interest significance. ;The infomation is as initially received without verification or dj
! valuation, and is ba.sically all that is known by IE staff on this date. . U Facility: Pacific Gas &: Electric. Company' . ' Licensee Emergency Classification:
Diablo Canyon > Unit .N,os.i 1 &; 2 v . . -
Notification of Unusual- Eventt .,
Docket.Nos. 50-275 &.50-323 - - - -
- Alert .
San Luis Obispo County,. California i Site Area Emergency General Ernergency
Subject:
XX Not' Applicable .
u TO PLANT. zINTAKE- -
A.REA BREAralATER -
H:avy rain, wind and sea over the: weekend. November 12-15, 1981, damaged approximately 50-75 fee of tha west segtion of the . intake area breakwater!' Damage .ncluded i washing away of. two more' concrete caps-(approximately 80-100 feet of.the cap was washed away during January 1981, ses PN0-V:8T-04) and scattering'of: sev'eral'of the 26 to 36-ton "tribars" (pr'ecast~ concrete interlocking amor pieces, which along with heavy. quarry stone were used in construction of -
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the breakwater) from the breakwater. ~ - -
. < -;-C There is apparently no damage to the . intake 'stheture itself, which'is'approximately- -
300 feet inside the breakwater.
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PG&E is evaluating the damage and with NRR concurrence will eventually come up with a
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plan to effect necessary repairs to the breakwater structure ~. ,
Region V resider.t inspectors are onsite and have observed the damage, which is expected to continue thrcushout the stona season.
Media interest is not expected. Neither the licensee nor the NRC plans to issue a news release. Regi:r V (San Francisco) received notification of this occurrence ~from the Resident Inspe: tors at 11:30 a.m. on 11/16/81.. This infonnation is current as of 1:00 p.m.
on11/16/81. ,
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CONTACT: T. Young, Jr., 463-3853 D. Sternberg, 463-3737 D M OF -
F i H m Es -
DISTRIBUTION: .
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Phil.1ips E/W. Willste Landow
- Ccr.rn. Gilinsky- AE0D RES "
. Conrn. Bradford PA Air Rights
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- Ccern. Ahearne .