ML18192B377

Letter Submitting Site Inspection Report for Palo Verde Nuclear Generating Station Units 1, 2 and 3 Conducted on 05/31/1977

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 '

U.S. NUCLEAR REGULATORY COMMISSION~ ooc~xCQe (2 2S) pFILE NUMBER NRC DISTRIBuTION FoR PART 50 DOCKET MATERIAL FROM: DATE OF DOCUMENT Dept, of the Army 8/8/77 Mr. William PE Gammill San Franci,sco, California DATE RECEIVED A Ei Wanket 8/12/77 ETTE R ClNOTORI2EO PROP INPUT FORM NUMBER OF COPIES RECEIVED 0 RIOIN*L UNC LASS IF I E 0 OPY DESCRIPTION ENCLOSVRE Consists of Site Inspection Report 86r Units 1, 2 and 3 ~ ~ ~ ~ ~

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~ I PLANT NAME:

R JL 9 i Palo Verde Units 1-2-3 8/16/77 CV'k (1-P) a g lg FOR ACTION/INFORMATION Ei&TI~NTAL ASSIGNED AD: V~ MOORE LTR BRANCH CHIEF ECT STAGER: PROJECT MANAGER:

HSING ASSISTANT: LICENSING ASSISTANT:

Bo HARLESS INTERNAL 0 ISTRI BUTION

<TFMS SAFETY PLAWi SYS~S SITE SAFETY Itc Z7 IN&'MAN TEDESCO ENVIRON ANALYSIS I z BENAROYA DENTON & ~HLER ENGINEERING IPPOLITO ENVIRO TECH ERNST PERATING REACTORS

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16 CYS ACRS SENT CATEGORY NRC FORM 195 (2 7S)

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~f DEPARTMENT OF THE ARMY SOUTH PACIFIC DIVISION,'CORPS OF ENGINEERS 630 Sansome Street, 'Room 1216.

San Francisco, California 94111 ATTEHTIOH OF:

SPDED-G 3 AUG 1S77 Mr. William P. Gammill Assistant Director for Site Technology Division of Site Safety and Environmental Analysis AUG>~REGOEA' "97~

U. 'S. Nuclear Regulatory Commission Washington, D. C. 20555 HVGEEAR CO+MISSIOI4 / ~ l goal Soc

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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 A. E. WANKET As stated 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.

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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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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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