ML18192B377
| ML18192B377 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 08/08/1977 |
| From: | Wanket A US Dept of the Army, South Pacific Div, Corps of Engineers |
| To: | Gammill W Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18192B377 (10) | |
Text
NRC FORM 19.'5 (2 2S)
U.S. NUCLEAR REGULATORY COMMISSION~
ooc~xCQe NRC DISTRIBuTION FoR PART 50 DOCKET MATERIAL pFILE NUMBER ETTE R 0
RIOIN*L OPY DESCRIPTION ClNOTORI2EO UNCLASS IFIE0 Mr. William PE Gammill PROP INPUT FORM ENCLOSVRE FROM:
Dept, of the Army San Franci,sco, California A
Ei Wanket DATE OF DOCUMENT 8/8/77 DATE RECEIVED 8/12/77 NUMBER OF COPIES RECEIVED Consists of Site Inspection Report 86r Units 1, 2 and 3 ~ ~ ~ ~ ~
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~I PLANT NAME: Palo Verde Units 1-2-3 RJL 8/16/77
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CV'k (1-P) a g FOR ACTION/INFORMATION lg Ei&TI~NTAL ECT STAGER:
HSING ASSISTANT:
ASSIGNED AD:
V~ MOORE LTR BRANCH CHIEF PROJECT MANAGER:
LICENSING ASSISTANT:
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<TFMS SAFETY IN&'MAN Bo HARLESS ISTRIBUTION PLAWi SYS~S TEDESCO BENAROYA SITE SAFETY Itc ENVIRON ANALYSIS DENTON & ~HLER ENGINEERING IPPOLITO PERATING
~ REACTORS ENVIRO TECH ERNST BALLARD BLOOD
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CZY A I EXTERNALOISTRIBUTION BAER B
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SITS ANALYSIS VOLIMR J~
COLLINS ER CONTROL NUM BE R I TIC REG IV J
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~f ATTEHTIOH OF:
DEPARTMENT OF THE ARMY SOUTH PACIFIC DIVISION,'CORPS OF ENGINEERS 630 Sansome Street, 'Room 1216.
San Francisco, California 94111 SPDED-G 3 AUG 1S77 Mr. William P. Gammill Assistant Director for Site Technology Division of Site Safety and Environmental Analysis U. 'S. Nuclear Regulatory Commission Washington, D. C.
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HVGEEAR REGOEA' CO+MISSIOI4
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Dear Mr. Gammill:
Inclosed is a Site Inspection Report prepared by our Los Angeles District concerning their 31 ofay 1977 inspection of Palo Verde Nuclear Generating Station, Units 1, 2 and 3.
Sincerely, 1 Incl As stated A. E.
WANKET Chief, Engineering Division oL
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SITE INSPECTION REPORT PALO VERDE NUCLEAR GENERATING STATION UNITS 1>>
2 AND 3 Uo S ~ ARMY ENGINEER DISTRICT, LOS ANGELES CORPS OF ENGINEERS JULY 1977
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J SXTE XNSPECTXON REPORT PALO VERDE NUCLEAR GE¹BATXNG STATXON UNXTS 1, 2 AND 3 I
l.
At the request of NRC, a site inspection of Units 1 and 2 was made on 31 May 1977'he inspection was conducted by Messrs.
R Van Horn, USGS~ E. O'Donnell and H. Lefevne, NRC, and L. Knuppel, C of E.
The purpose of the inspection was to inspect the exposed bearing stratum that forms the foundation for Category 1 structures of Unit 2 and to review compaction procedures and results of contruction control tests for structural Category 1 backfills currently under construction at Unit 1.
2 The inspection disclosed that the contractor has selected an orientation different from the plan presented in the PSAR, for the foundation excavation of Unit 2.
As a result of this change, the Fuel building will be founded entirely on compacted backfill~
Xt was also observed that the foundation design for the Containment building has apparently been changed since the PSAR> resulting in about 1/4 of the Tendon gallery of Units 1 and 2 being placed on a confined compacted backfill rather than in-situ material as 'shown on figure 2T-6-2, L
Amendment 8 of the PSAR, dated 20 June 1975.
I 3.
Visual observations of the surface of the excavated Unit 2 bearing
'stratum revealed that the undisturbed foundation material is a hard,
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~'edaish br'own clay, with no apparen" discontinuities.
The bearing
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'urface had been cleaned and over-excavated about 4 inches to allow placement of a mud mat.
4'he observed operation of placement of structural backfill at Unit 1 was very good both on grade and at the stockpile area. It was reported that the fillarea described as "Power Block 1 Area K," had been removed for the full placement depth (about 6 to 8 feet) and replaced, after construction control testing disclosed that the placed material did not comply with the specified gradation and density l
requirements.
Backfill at this area had been accomplished at the time of the site inspection. It should be noted, that this fillwas being scrutinized by the NRC prior to its removal.
5.
The density and gradation quality control tests for the Power Block 1 Area K fillwere reviewed by Mr. L. Knuppel.
The data indicate that the replaced fillmeets specification requirements Quality control test data were requested for the Category 1 structural fillplaced under the Unit 1 Containment building Tendon gallery.
-The data will be reviewed by the Los Angeles District when received.
4 6 ~
After inspection of the Unit 2 bearing stratum and discussions with NRC and..USGS representatives, it was agreed that the foundation stratum is satisfactory an'd construction could proceed.
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