ML20137J745

Forwards Initial Site Exam Info Review for Napot Point Site

ML20137J745
Person / Time
Issue date:	03/29/1977
From:	Gammill W Office of Nuclear Reactor Regulation
To:	Miraglia F Office of Nuclear Reactor Regulation
Shared Package
ML20136D877	List: IA-85-475, Forwards Review of Section 2.4, Meteorology, of Philippines Site Investigation Rept.Section Lacking Description of Onsite Meteorological Monitoring Sys & Local Diffusion Characteristics & Diffusion Estimates ML20136D871 ML20137J724 ML20137J731 ML20137J739 ML20137J745 ML20137J751 ML20137J758 ML20137J764
References
FOIA-85-475 NUDOCS 8509110230
Download: ML20137J745 (8)

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As :ggested in H. R. Denton's Feb 16. 1977 cemorandum, the Geosciences l

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,, INITIAL SITE EEA!!INATION INFOPJtATION PpVIEW PHILIPPINE NUCLEAR P0tER PLANT NATIONAL PO*ER CO?IORATION l NAPOT POINT SIIE 2.6 CIOLoct AND SEISHOLOGY ,

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2.6.1 BASIC GEOLOGIC AND SEISMIC INFORMATION

, 2.6.1.1 Geologic Information i . [

] The Philippine Nuclear Power Plant, Unit No.1, is located adjacent .

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to the South China Sea at Napot Point on. the southwest flank of i

' a historically-inactive stratovolcano, Mt. Natib. Viable hazards

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1 to be censidered at this location are consequently primarily volcanic-related. Although some discuss' ion of the volcanic hazard s has been presented in the Preliminary Site Investigation Report, ,

i j the subject has not been thoroughly addressed. This shortcoming -

is acknowledged in the report and additional.stna4== are being

Performed. As a suggestion, the following items might be considered 4

l upon further evaluation of the volcanic hazard: ',

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{ a. Active Volcanoes - Apparently three active volcanoes -

1 Taal, Mt. Banakao and Mt. San Cristobal - are within 101-142

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km of the proposed site. Although most volcano-related . hazards would not be considered due to the remoteness of the site f

4 from these sources, ash fall should be assessed. This hazard.

is,enrrently being evaluated at two sites in the Unit'ed States

, (Pebble Sp, rings, Units 1 and 2, and Skagit, IInits 1 and 2).

l The Pebble Springs site is nearly 200 km from the assumed source.

HiAccricalashfalls,includingthicknessranges,distancefromthe e

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. source, and prevailing winds, are some of the parameters tole assessed.

b. Ina'ctive Volcanoesf - Even though Mt. Natib has no record of Mstoric activity, it is likely that Mt. Natib, under current NRCpractice, would be considered active, considering the prodmity of Mt. Mariveles (21 km SE of the proposed site) and its relatively recent (geologically sp'eaking) eruption of 4,000 ybp.

Furtemore, volcanoes have been known to become active aft'er long periods of quiescence. Fo.r example Mt. Mazama in the Cascade Ranga is believed to have passed through two periods of dormancy, ,

the last of which may have been as long as 5,000 years just prior to the culminating series of eruptions 7,000 years BP (Shannon &

Wilson,1976 Report to Portland General Electric Co. Volcanic Hazards .

Stu@ Pebble Springs Nuclear Plant Site). Our suggestion is that effort be directed toward detemining the eruptive histories and types of ejecta and distances from the sources of the different types of ejecta of the two volcanoes - Mt. Natib and Mt. Mariveles - as a basis for deciding whether Mt. Natib should be considered inactive.

c. Mudflows - Two Mt. Natib mudflows have been. mapped - one on the south flank and another on the southwest flank. The nearest flow is within two he of the proposed site. It would appear that this type of phenomenon may not be limited to eruptive periods and should be considered possible at any time. Additional rationale should be provided in the report demonstratins that the plant would not be affected if a large flow were to occur.

3-L Ashfall - Documentation should be provided discounting m ashfall hazard. originating from nearby, as well as distant, alcanoes.

k addition, the massive slide indirectly related to volcanism,

, Se Mapalan block, requires further description. Neither the -

location, dimensions, current rate of movement, nor potential hazard to the proposed site are discussed thoroughly.

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2.6.1.2 The hvelopment of seismic information is largely complete, but some adddinvestigation into descriptions of historic earthquakes may be necesary for an adequate determination of maximum vibratory ground i

motia. Specifically, it is not clear from the Preliminary Site Investigation Report (PSIR) that the historic record was exhaustively examined.

The PSIR, based largely on the catalog of Repetti, reports.

j only sinor effects were observed from local or nearby earthquakes of the 19th century. Isoseismals, however, drawn for some of those g

earthgsakes by Jesuit observers at Manila and on which, to th knowledge, much of Repetti's, data are either based or correlated, suggest that

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high fatensities may have occurred on the Bataan Peninsula during historic time. Copies of these isoseismal maps are appended. If, in

~ fact, these isoseismal estimates are erroneous, (see, for example, the

{ estimates of events in 1872, 1877, 1879, 1882, etc.) arguments should be developed to discount them.

Historic seismicity is a crucial source i

of information in detennining the SSE and in this area some further investigation is needed.

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O 2.6.3 FM FAULTI.NG Fadting would appear to be difficult to detect in the geologic i

te= min within the site vicinity. Surface exposures, as '

4,Nated'in Tig. 2.6.1-27, Outcrop Map Within 5 km Radius of ,

Nape Point Site, appear to be confined, with the exception of the3mhar, to the coastal area. Remote sensing would seus to be

, a sudal tooI in assessing the faulting regime. Considering the ,

panzeiy of exposures within 5 km of the site it is difficult ,

to esision what type of field investigations were conducted in the case of say, Linear Features 4,10 and 11. Provide additional documentation (e.aps, trench logs, borings, etc.)

of If= ear investigations within 5 km of the site. -

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, Apparently additional studies are being conducted at the. site as null as off-shore. These investigations should be particularly thorough considering the prevalance of Holocene faulting in the

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Philippines (see Fig. 2.6.1-5, Generalized Geology of the Site P.agica) . .

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.ae reactor structure will be founded on the slightly weathered .

a.

to f: ash rock. This seems to be the best method to support Category I stesetures and components at this site. The PSAR should provide

, detafIed discussions regarding excavation methods, to assure competent foundation support. This discussion should include structural fill requirements and specifications. Swell potential of backfill material should be addressed in the PSAR. *

b. Tha PSAR should include information regarding the stability of all slopes, both natural und nannada, the failure of which could adversely affect the nuclear power plant. Reports and investigations of regional 1andslides shoul[be presented and compared with the site geologic *

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conditions.

• c.

The ultimate heat sink for the cooling water system should,be , _, , ,

described in the PSAR. This should include au water sources, including necessary ret =fn4"g structures, and the canals or conduits connecting

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l the sources with the nuclear power plant. Reservoir 1inings 'should be provided to linic seepage losses.

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