ML20133H134
| ML20133H134 | |
| Person / Time | |
|---|---|
| Issue date: | 03/15/1977 |
| From: | Gammill W Office of Nuclear Reactor Regulation |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20133G739 | List: |
| References | |
| FOIA-84-559 NUDOCS 8510160281 | |
| Download: ML20133H134 (8) | |
Text
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t NUCLEAR REGutATOltY COMMISSION y
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j NAR 15 1311 F. J. Miraglia, Technical Assistant, Divir'on of Site MEMORANDU:I FOR:
Safety and Environmental Analysis W. P. Gammill, Assistant Director for Site Technology, DSE FRCH:
PHILIPPINE PRELIMINARY SITE INVESTIGATION REPORT
SUBJECT:
As suggested in H. R. Denton's Feb. 16, 1977 memorandum, the Geosciences Branch has reviewed (geology and foundation engineering) the subject report in accordance with the Initial Site Examination Information (ISEI) review The seismological review is in jrogress and should be procedure.
completed shortly.
The geologic and foundation engineering comments of Section 2.6, Geology and Seismology, are attached.
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William P. Gacmill, Assistant Director for Site Technology Division of Site Safety and Environmental Analysis
Enclosure:
As stated cc: w/ enclosure B. Eucche E.fase tr. Lafleur R. Vollmer D. Bunch L. Hulman J. Stepp R. Hofmann J. Kelleher J. Greeves H. Lefevre L. Heller 8510160281 851001 PDR FOIA SCHLEMM 84-559 PDR
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INITIAL SITE EXAMINATIOy INFORMATION REVIEW PHILIPPINE NUCLEAR POWER PLANT NATIONAL POWEP. CORPORATION NAPOT POINT SITE 2.6 CEOLOGY AND SEISMOLOGY 2.6.1 BASIC GEOLOGIC AND SEISMIC INFORMATION 2.6.1.1 Geologic Information The Philippine Nuclear Power Plant, Unit No. 1, is located adjacent to the South China Sea at Napot Point on the southwest flank of a historically-inactive stratovolcano, Mt. Natib. Viabic hazards to be considered at this location are consequently primarily volcanic-related. Although sone discussion of the volcanic hazards has been presented in the Preliminary Site Investigation Report, the subject has not been thoroughly addrensed. This shortcoming is acknowledged in the report and additional studies are being perforned.
As a suggestion, the following items might be considered upon further evaluation of the volcanic hazard:
Active Volcanoes - Apparently three active volcanoes -
a.
l Taal, Mt. Banakao and Mt. San Cristobal - are within 101-142 km of the proposed site.
Although most volcano-related hazards would not be considered due to the remoteness of the site from these sources, ash fall should be assessed. This hazard 1
is currently being evaluated at two sites in the United States (Pebble Springs, Units 1 and 2, and Skagit, Units 1 and 2).
The Pebble Springs site is nearly 200 km from the assumed source.
Historical ashfalls, including thickness ranges, distance from the l
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4 to be assessed.
'h Inactive Volcanoes - Even though Mt. Natib has no b.
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record of historic activity, it is likely that Mt. Natib, with the information currently provided in the report would, under current NRC
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This is primarily based upon the practice, be considered active.
Mariveles (21 km SE of the proposed site) and its f
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'd proximity of Mt.
There l
(geologically speaking) eruption of 4,000 B.P.
relatively recent Natib is insufficient sampling and dating of volcanic ejecta from Mt.
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flanks) to place any confidence (especially on the north, east and west in the time of latest activity.
Our suggestion is that substantial ef fort be directed toward dif f erentiating.the eruptive histories and Natih (7 km from nearer.t rin) types of ejecta of the two volcanoes - Mt.
Balankibob (33 Mariveles (21 km SE of the site) as well as Mt.
and Mt.
Natib an inactive.
l km NE of the site) in an attempt to further classify Mt.
In the event Mt. Natib were classified active, all volcanic hazards should be considered possible at the site.
I Natib mudflows have been mapped - one on the Mudflows - Two Mt.
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The nearest flow is south flank and another on the southwest flank.
i within two km of the proposed site.
It would appear that this type l
of phenomenon should not be limited to eruptive periods but should be considered possible at any time providing sufficient material is available f
Additional rationale on the flank of the volcano for transport.
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should be provided in the report demonstrating if a large flow
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were to occur, that the plant would not be affected.
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Ashfall - Documentat, ion should be provided discounting an ashfall hazard originating from nearby, as well as distant, volcanoes.
In addition, the massive slide indirectly related to volcanism, the Mapalan block, requires further description.
Neither the location, dimensfons, current rate of movement, or potential hazard to the proposed site are discussed thoroughly.
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2.6.1.2 Seismic Info _rmption To be developed by J. Kelleher 9
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2.6.3 SURFACE FAULTING to detect in the geologic Faulting would appear to be difficult 4
terrain within the site vicinity. Surface exposures, as indicated in Fig. 2.6.1-27, Outcrop Map Within 5 km Radius of i
Napot Point Site, appear to be confined, with the exception of r
Remote sensing would seem to be I
the lahar, to the coastal area.
Considering the I
a useful tool in assessing the f aulting regime.
paucity of exposures within 5 km of the site it is difficult i
f to envision what type of field investigations were conducted i
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in the case of Linear Features 4, 10 and 11.
l additional documentation (maps, trench logs, borings, etc.)
of linear investigations within 5 km of the site.
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Apparently additional studies are being conducted at the site 3
The.4e investigations should be particularly as well as off-shore.
thorough considering the prevalance of Holocene f aulting in the Philippines (see Fig. 2.6.1-5, Generalized Geology of the Site i
i Region).
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2.6.4 STABILITY OF SUBSURFACg MATERIALS The reactor structure will' be founded on the slightly weathered a.
to fresh rock. This seems to be the best method to support Category I structures and components at this site.
The PSAR should provide detailed discussions regarding excavation methods, to assure competent This discussion should include structural fill foundation support.
requirements and specifications.
Swell potential of backfill material should be addressed in th2 PSAR.
The PSAR should include information regarding the stability of all b.
slopes, both natural and manmade, the failure of which could adversely affect the nuclear power plant.
Reports and investigations of regional landslides should be presented,and compared with the site geologic conditions.
The ultimate heat sink for the cooling water system should be c.
described in the PSAR. This should include all water sources, including
, necessary retaining structures, and the canals or conduits connecting the sources with the nuclear power plant.
Reservoir linings should be provided to limit scepage losses.
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"4 UNITED STATES
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W ASHINGTON, D. C. 20666
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Joseph D. Lafleur, Deputy Director [
MEMORANDUM FOR:
Office of International Programs FROM:
Harold R. Denton, Director Division of Site Safety and Environmental Analysis
SUBJECT:
PHILIPPINE PRELIMINARY SITE INVESTIGATION REPORT As per your request of February 14, 1977, DSE has reviewed the subject report. The scope of the review was such to identify issues which warrant further consideration by the prospective applicant. An implicit assumption in this review is that existing NRC criteria would be applicable to this proposed station.
As a result of this review the enclosed coments were received from the DSE technical staff. Due to press of other business, the seismological review has not been completed, but it is expected that our comments in this area can be forwarded to you during the week of March 21, 1977. Depending upon j
existing priorities and availability of staff, we wo ild be happy to discuss these coments with your office.
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Harold R. Denton, Director Division of Site Safety and Environmental Analysis Office of Nuclear Reactor Regulation i
Enclosure:
As stated cc:
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ACCIDENT ANALYSIS EVALUATION PRELIMINARY SITE INVESTIGATION REPORT PHILLIPPINE NUCLEAR POWER PLANT Population Density The National Power Corporation has supplied demographic data for the time period 1975-2020 out to a 50 Km radius.
The population density at 50 Km (31 miles) for 1975 and 2020 is 87/Km2 and 477/Km2 respectively.
Figure I shows the current and projected population at 50 Km radius to be 685,827 and 3,740,045 respectively.
This figure indicates that the current and pro-jected populations fall within the current NRC guideline values of 500 and 1000 people / mile 2 respectively.
We see nothing unusual in the present and the projected population at this site which would require the review of alternate sites.
Nearby Facilities The light road traffic in the vicinity of the reactor site consists of mini-bus, jeepneys and tricycles on P.oute 312 which passes within 1.5 Km n the site.
The only marine traffic listed by the applicant on the South China Sea, adjacent to the site, is by 20 motorized boats which carry six to ten persons.
The airstrip at Morong which was used by the Long Beach Mining Corpo currently unused and is not being maintained.
patterns in the vicinity of the site.
No mention is made of flight We have noted no nearby transportation or industrial facilities which could affect the safe operation of this pro-posed nuclear power plant.
Section 2.2.3, Evaluation of Potential Accidentt, has not been provided so that we are unable to coment further in this arta.
We do note from Figure 2.2-15 that a Naval Reservation is located about 15 Km (5.8 m proposed site.
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Additional Comment It appears from Figure 1.1-1 that the turbine is in a non-peninsular NRC would request additional analysis to show that a turbine orientation.
f missile would not damage structures or systems critical for nuclear safety.
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philippine Nuclear Fower Plant Unit No.1 7
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2 2,590/ KM
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YEAR 1975
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DISTANCE FROM PLANT, KI LOMETERS FIGURE 1 Cumulative Population Distribution (gg i g j
HYDROLOGTC ENGINEERING EVALUATIOI.
PRELIMINARY SITE INVESTIGATION REPORT PHILIPPINE NUCLEAR POWER PLANT The proposed site is on Napot Point of Bataan Peninsula, on the western side of Luzon Island. Napot Point juts out into the South China. Sea and is the northern boundary of Bagac Bay. Two small creeks border the point, but no streams cross the proposed plant area. The plant will be an open-cycle cooling system with a flow rate of about 600,000 gpa and a temperature rise of about 14 F across the condenser.
Freshwater needs for the plant are estimated to be about 750 gpm, and will be obtained from onsite wells to be developed by the applicant.
Plant grade is planned to be about +18m, MSL which will require some cut and fill.
The applicant investigated flooding potential at the site from various sources including probable maximum flooding on nearby creeks, local probable maximum precipitation on plant grade, a probable marf mum typhoon and a probable maximum tsunami. According to the applicant's studies, flooding of the site due to a probable maximum flood on the nearby creeks does not appear possible, but subsequent access to the site may be a problem. Similarly, local probable maximum precipitation will be considered in the design of safety-related structures and the plant drainage system.
A probable maximum typhoon was estimated for the site using techniques similar to those employed by the U. S. National Weather Service in the development of Probable Maximum Hurricane criteria for the East and 1,44g 3 g 077 I
e Culf coasts of the United States. The applicant estimated that the maximum surge (stillwater level) at the site, using the bathstrophic storm surge model and including initial rise and astronomical tide, would be about 3.3m, MLLW (equal to about 2.8m, MSL). Runup from the maximum wave was estimated to be to about 14.6m, MSL at the extreme western end of the point of the coast. Runup nearer the site area t
will be somewhat less.
A probable maximum tsunami was estimated by assuming an earthqsake occurs in the Manilla Trench, some 125km west of the site. The move-ment is assumed to occur over an area that is 40km wide and 200km long with a maximum downward displacement of the sea floor of 4m in about 10 seconds. The resulting disturbance of the sea surface was routed to the coast by a two-dimensional model. Based on this estimate, the t
maximum drawdown at the coast would be to about -11.6m, MLLW and the maximum runup to about 12.9m, MLLW.
Since plant grade will be at 18m, MSL (18.5m, MLLW), no safety-related structures on plant grade should be affected by flooding.
However, the sources of water for the Ultimate Heat Sink was not discussed. If an intake structure on the coast is planned to provide this water, it would have to be designed for the flooding and low water conditions discussed above.
Ground water in the site area was investigated in some, detail by the applicant. According to his studies constructipn of the plant would not adversely affect any nearby uses. In case of an on.ite spill of radioactive liquids, the direction of flow would be toward the coast and there are no users between the site and the coast.
thUt 1 L 1977
4 The design basis ground-water level was not specified, but a brief 4
inspection of the observed ground-water levels in the site area indi-I cates that post-construction piezometric ground-water levels may be at (or possibly above) plant grade. This is due to the fact that some of the aquifers in the area are under artesian pressure and the applicant plans some cut and fill.
In general the applicant appears to have done a considerable amount of study prior to this preliminary report. The areas that i
would need further clarification are, for the most part, already idanti-fied by the applicant. The areas that appear to warrant closer study (1) the location and design of the intake for safety-related are:
water (UHS); (2) the design of the roofs of safety-related structures and site drainage for a local probable maximum precipitation; and (3) the post-construction ground water levels.
In addition, the bases for the assumptions used in developing both the probable maximum typhoon and tsunami need to be discussed in much more detail and substantiated as being conservative.
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METEOROLOGY EVALUATION PRELIMINARY SITE INVESTIGATION REPORT PHILLIPPINE NUCLEAR POWER PLANT e
Section 2.4 Meteorology of the subject report has been reviewed and j
found to contain an excellent climatological description of the site area. The section, however, was lacking a description of any onsite meteorological monitoring system and most importantly a discussion of local diffusion characteristics and calculations of any diffusion estimates (X/Q values). Without this type of information, the proposed site cannot be properly evaluated from a meteorological standpoint.
It is reconnended that the report present the appropriate onsite and/or offsite meteorological data and provide the type of information indicated in Sections 2.3.3, 2.3.4, and 2.3.5 of Regulatory Guide 1.70 and the Standard Review Plan.
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GEOSCIENCES EVALUATION PRELIMINARY SITE INVESTIGATION REPORT PHILIPPINE i!UCLEAR POWER PLANT CEOLOGY.*'D SEIS!:0LO';Y u
2.6 2.6.1 BASIC CEOLOGIC AND SEISitIC INFOPJ!ATION 2.6.1.1 Geologic Information The Philippine Nucicar Power Plant, Unit No.1, is located adjacent to the South China Sea at Napot Point on the southwest flank of a historically-inactive stratovolcano, Mt. Natib.
Viable hazards to be considered at this location are consequently primarily volcanic-related. Although some discussion of the volcanic hazards has been presented in the Preliminary Site Investigation Report, the subject has not been thoroughly addressed.
This shortcoming is acknowledged in the report and additional studies are being performed.
As a suggestion, the following items might be considered upon further evaluation of the volcanic hazard:
a.
Active Volcanoes - Apparently three active volcanoes -
Taal, Mt. Banakao and Mt. San Cristobal - are within 101-142 km of the proposed site. Although most volcano-related hazards would not be considered due to the remoteness of the site from these sources, ash fall should be assessed. This hazard is currently being evaluated at two sites in the United States (Pebble Springs, Units 1 an.' 2, and Skagit, Units 1 and 2).
The Pebble Springs site is nearly 200 km from the assumed source.
Historical ashfalls, including thickness ran es, distance fron the l
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source, and prevailing winds, are some of the parameters 4
to be assessed, b.
Inactive Volcanoes - Even though Mt. Natib has no record of historic activity, it is likely that Mt. Natib, with the infornation currently provided in the report would, under current NRC practice, be considered active. This is primarily based upon the f
proximity of Mt. Mariveles (21 km SE of the proposed site) and its l
relatively recent (geologically speaking) eruption of 4,000 B.P.
There is insufficient sampling and dating of volcanic ejecta from Mt. Natib (especially on the north, east and west flanks) to place any confidence in the time of latest activity. Our suggestion is that substantial 4
effort be directed toward differentiating the eruptive histories and types of ejecta of the two volcanoes - Mt. Natib (7 km from nearest rim) i f
and Mt. Mariveles (21 km SE of the site) as well as Mt. Balankibob (33
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km NE of the site) in an attempt to further classify Mt. Natib as inactive.
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In the event Mt. Natib were classified active, all volcanic hazards i
should be considered possibic at the site.
l Mudflows - Two Mt. Natib mudflows have been mapped - one on the c.
f south flank and another on the southwest flank. The nearest flow is within two km of the proposed site.
It would appear that this type l
of phenomenon should not be limited to eruptive periods but should be considered possible at any time providing sufficient material is available on the flank of the volcano for transport. Additional rationale i
3 should be provided in the report demonstrating if a large flow were to occur, that the plant would not be affected.
t d.
Ashf all - Documentation should be provided discounting an ashfall hazard originating from nearby, as well as distant, volcanoes.
In addition, the massive slide indirectly reinted to volcanism, the Mapalan block, requires further description.
Neither the location, dimensions, current rate of movement, or potential hazard to the proposed site are discussed thoroughly.
2.6.1.2 Seismic Information T9 ha proyided during w.eek of March 21, 1977 I
2.6.2 Vibratory Cround Motion To be provided during week of March 21, 1977.
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2.6.3 SURFACC FAULTING Faulting would appear to be dif ficult to detect in the geologic terrain uithin the site vicinity. Surface exposures, as indicated in Fig. 2.6.1-27, Dutcrop tbp k'ithin 5 km Radius of Napot Point Site, appear to be confined, with the exception of the lahar, to the coastal area. Remote sensing would seem to be a useful tool in assessing the faulting regime.
Considering the paucity of exposures within 5 km of the site it is difficult to envision what type of field investigations were conducted in the case of Linear Features 4, 10 and 11.
Provide additional documentation (maps, trench logs, borings, etc.)
of linear investigations within 5 km of the site.
Apparently additional studies are being conducted at the site as well as off-shore.
These investigations should be particularly thorough considering the prevalance of Holocene faulting in the Philippines (see Fig. 2.6.1-5, Generalized Geology of the Site Region).
W16 1377 e
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s 2.6h4 STABILITY OF SUBU.I'. RACE MATERI ALS
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a.
The reactor structure will be founded on the slightly weathered
~'
s to fresh rock. This seems to be the best method to support Category I structures and components at this site.
The PSAR should provide detailed 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.
The PSAR should include information regarding the stability of all slopes, both natural and manmade, the failure of which could adversely affect the nuclear power plant.
Reports and investigations of regional landslides should be presented and compared with the site geologic conditions.
c.
The ultimate heat sink f or the cooling water system should be described in the PSAR.
This should include all water sources, including necessary retaining structures, and the canals or conduits connecting the sources with the nuclear power plant.
Reservoir linings should be provided to limit seepage losses.
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