ML14364A269
| ML14364A269 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 12/22/2014 |
| From: | Pacific Gas & Electric Co |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML14364A259 | List: |
| References | |
| DCL-14-103, FOIA/PA-2016-0438 | |
| Download: ML14364A269 (67) | |
Text
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 1 of 17 TERRESTRIAL SPECIAL STATUS 1 SPECIES WITH POTENTIAL TO OCCUR ON THE DIABLO CANYON LANDS 2 Species Common Species Status-Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Euphilotes Smith's blue FE none No North and South Outside known range; not Low - Outside known enoptes smithi butterfly Ranches; coastal scrub known from SLO County.
range; special habitat vegetation containing Prefers coastal dunes and elements (coastal scrub buckwheat (Eriogonum coastal scrub associated with Erogonon spp.)
spp.)
with host plant (several present; multiple survey species of wild buckwheat).
results negative.
Helminthoglypt Morro FE none Yes none Near current known range; Low - Suitable habitat a walkeriana shoulderband Los Osos Valley to the and special habitat snail coast; south through elements lacking; failure Montaf*a de Oro, and north to detect during long-to Toro Creek. Found on term monitoring dune soils with dense scrub cover, duff layer below.
Ambystoma Califomia tiger FT STISSC No South Ranch, Parcel P; within current known range; Low - true vernal pools califomiense salamander ephemeral and prefers ephemeral pools for are not present; intermittent streams may breeding, rodent burrows for ephemeral channel provide some breeding escape and estivation.
pools occur in Diablo habitat Creek and several drainages on the South Ranch; multiple survey results negative
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 2 of 17 Species Common Species Status' Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Rana draytonii California red-FT SSC No North and South within current known range; Low -multiple survey legged frog Ranches and Parcel P; occurs in pools in streams results negative Lower Coon Creek, and marshes and Tom's Pond on the North occasionally in ponds at Ranch; Diablo Creek in least 2 feet Parcel P; ephemeral deep. Requires shoreline drainages and vegetation that provides abandoned irrigation shade at water level and ponds on the South cattails or other emergent Ranch.
vegetation for cover.
Tancha torosa Coast Range none SSC No North and South within current known range; Moderate - Suitable newt (Montere Ranches and Parcel P; requires slow moving habitat and special y County all seasonal and streams (class 1, 2 or 3) or habitat elements south perennial streams and ponds.
present; multiple survey only) ponds on the Diablo results negative Lands could potentially serve as breeding sites.
Emys Western pond none SSC No North and South within current known range; Moderate - Suitable marmorata turtle Ranches as well as known horn San Luis Creek habitat and special Parcel P; Lower Coon just south of Diablo Lands.
habitat elements Creek and Tom's Pond Requires slow moving present; multiple survey on North Ranch; Diablo streams (class 1, 2 or 3),
results negative Creek in Parcel P; pools and/or ponds.
intermittant drainages with some persistant pool habitat on the South Ranch.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 3 of 17 Species Common Species Status3 Record of Area(s) of Potential RangeiHabitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Phrynosoma Blainville's none SSC No North and South within current known range; Moderate - Suitable blainvillii homed lizard Ranches and found in various vegetation habitat and special (aka, California undeveloped portions of communities with open habitat elements are homed lizard)
Parcel P; coastal scrub, areas of sandy or gravelly present, multiple survey chapparal and bishop soil present, sandy washes, results negative.
pine cover types with edges of dirt roads.
friable soils and open vegetative structure.
Anniella Silvery legless none SSC Yes North Ranch; mouth of within current known range; Low - Suitable habitat pulchra lizard Coon Creek Populations occur in coastal very limited (mouth of pulchra dunes north and south of the Coon Creek beach);
Diablo Lands.
multiple survey results there negative.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 4 of 17 Species Common Species Status-Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Thamnophis Two-stripped none SSC No North Ranch and Parcel Within current known range; Low - Suitable habitat hammondii garter snake P; Coon Creek, Tom's this snake is highly aquatic present in areas of Pond, Diablo Creek and feeds on other aquatic permanent fresh water, vertebrates (fish and multiple survey results amphibians).
negative Channa Southern rubber none ST Yes; North and South not within current known Low - Survey results umbratica boa http://wvww.c Ranches; coastal range; SLO records negative; taxonomy of alifomiaherp maritime chaparral and comprise isolated San Luis Obispo County s.com/snake closed cone pine forest population; could be C.
records unclear.
s/maps/cbott areas.
umbratica / C. bottae aemap.jpg intergrade. Closed-cone pine forest and riparian corridors.
Elanus White-tailed kite none SFP No North and South not within current breeding Low - No occurrence leucurus Ranches and Parcel P; range; in SLO County, they records for this species suitable habitat occurs in are most common from exist for the Diablo oak woodlands, Morro Bay north.
Lands; multiple survey grasslands, and riparian results negative corridors
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 5 of 17 Species Common Species Status.
Record of Area(s) of Potential RangeiHabitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Asio otus Long-eared owl none SSC No North Ranch and Parcel within historical range, but Low - Few records (nesting)
P; riparian corridors of outside current breeding document this owl from Coon and Diablo Creeks range; coastal SLO County.
suitable for breeding One wintering owl was observed in Montana de Oro State Park in 1965; survey results negative on Diablo Lands Athene Burrowing owl none SSC Yes North and South within historic breeding High - Known to occur cunicularia (Burrow Ranches; suitable range and outside current on the North and South sites &
habitat occurs in grazed known breeding range; a Ranches as a non-some grassland (North Ranch),
grassland species adapted breeding winter wintering and near the edges of to areas highly altered by residents; this bird is sites) agricultural fields (South human activity (e.g.,
believed nearly Ranch). One incidental agriculture). Suitable habitat extirpated as a breeding sighting of a burrowing contains burrows for species in coastal San owl within Parcel P is roosting and nesting and Luis Obispo County.
known (S. Krenn).
short vegetation.
Strix California none SSC No upper Diablo Creek within current known range; Low - Habitat occurs in occidentalis spotted owl (Parcel P) and Irish In San Luis Obispo County, Diablo and Irish occidentalis Canyon Creek; coastal found in interior canyons canyons. These areas live oak riparian with narrow riparian are known to support woodland corridors. Some occur in great homed owls which coastal areas, but these are reduces suitability for S.
probably wintering birds.
- o. occidentalis. Multiple survey results negative.
Circus Northern harrier none SSC No North and South within current known Low - Diablo Lands do cyaneus (nesting)
Ranches and Parcel P; breeding range; In SLO not open grassland and County, harriers are offer any highly suitable agricultural fields common winter visitors, nesting habitat; multiple Breeding harrers are most survey results negative.
common along the coast north of Morro Bay and in the eastern part of the county.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 6 of 17 Species Common Name Species Status-Federal State Record of Occurrence Area(s) of Potential Occurrence Range/Habitat Assessment Occurrence Potential Aquila Golden eagle none SFP Yes North and South within current breeding High - Known to forage chrysaetos Ranches and Parcel P; range; prefers open, sloping over Diablo Lands North observed foraging over landscapes for foraging.
and South of the plant the Diablo Lands or Nests on cliffs or in large site; Breeding golden utilizing both utility poles trees. Sometimes known to eagles are not common and designed raptor nest on electrical in San Luis Obispo perch structures provided transmission towers.
county, and most for their use (North coastal breeding occurs Ranch).
north of the city of San Luis Obispo. To date, no nest sites have been found on the Diablo Lands.
Gymnogyps California FE SE / SFP Yes North Ranch, South within current known range; Low - Moderate - A califomianus condor Ranch; foraging habitat suitable nesting habitat is Califomia condor was only lacking on the Diablo Lands; sighted in 2012 (the first foraging along coastal bluffs such record from the and terraces only.
Pecho Coast since the1970s) during routine monitoring surveys performed on the North Ranch.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 7 of 17 Species Common Species Status' Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Falco American DL SFP Yes North Ranch, South within current known nesting High - Known to occur, peregnnus peregnine falcon Ranch, Plant Site; Nests range; in coastal areas nests nests on off-shore rocks anatum on off-shore rocks on off-shore rocks and at two locations adjacent to and north of coastal bluffs; adjacent to the Diablo the plant site.
Lands; forages along coastal bluffs and coastal terrace.
Lanius Loggerhead none SSC Yes North and South not within current known High - Known to occur, ludovicianus shnke (nesting)
Ranches; open breeding range; In SLO records are from grassland, agricultural County, it is a common outside the breeding fields.
winter visitor in agricultural season only.
areas, grassland, and, to a lesser extent, in oak savannah. Breeding shrikes are not common along the coastal region of the County.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 8 of 17 Species Common Species Status, Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Setophaga Yellow warbler none SSC Yes North Ranch; riparian within current known High - Known to occur, petechia (nesting) habitats with a dense, breeding range; In small numbers of multi-layered tree canopy SLO County, it is found breeding pairs have and heavy brush throughout the interior been recorded from understory; lower Coon riparian areas and is locally Coon Creek riparian Creek riparian zone.
common at some sites on zone.
the south coast, including Oso Flaco Lake and Oceano.
Agelaius Tricolored none SSC Yes North Ranch; tule within current known Low - only one record tricolor blackbird (nest patches near mouth of breeding range; they are of this species has been colony)
Coon Creek and at colonial birds that seek recorded from the Tom's Pond; also South cover and nest in emergent Diablo Lands and it was Ranch in upper Irish vegetation, particularly a solitary bird seen at Canyon cattails and tules.
Tom's Pond during surveys in the early 1990's. Multiple surveys from 2005 through 2011 failed to identify a nesting colony.
Ammodramus grasshopper none SSC Yes North Ranch; associated within current known High - Known to occur, savannarum sparrow (nesting) with open grasslands breeding range; occurs in multiple survey results (mostly non-native) with native and non-native suggest a small moderate ground cover grasslands, preferring open breeding population and plant heights from 4 grasslands with bunch exists in grassland to 18 inches.
grasses and areas of bare habitat on the North ground.
Ranch.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 9 of 17 Species Common Species Status' Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Ictena virens Yellow-breasted none SSC No North Ranch; Coon within current known Low - this species is chat (nesting)
Creek riparian zone breeding range; the yellow-rare in the coastal breasted chat inhabits dense region. Two records of rpanan thickets throughout chats in Coon Creek at the lowlands and foothills of Montana de Ore State California.
Park in June indicate this species may occasionally breed there. Multiple survey results negative Stemula California Least FE SE, SFP No North Ranch; mouth of within current known range; Low - habitat is antillarum tern Coon Creek.
Califomia least terns nest in marginal consisting of browni colonies on bare or one sand beach area sparsely vegetated flat near the mouth of Coon substrates near the coast.
Creek; multiple survey results all negative.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 10 of 17 Species Common Species Status3 Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Pelecanus Brown pelican DL SFP Yes North Ranch, South within current known range High - Known to occur, occidentalis Ranch, Plant Site; roosts (non-breeding); roosts on forages along coastline on off-shore rocks, off-shore rocks, coastal during non-breeding coastal bluffs, and man-bluffs, and some man-made season made structures near the structures tidal zone (piers and breakwaters)
Vireo bellii Least Bell's FE SE No North Ranch; Coon within historic range but Low - habitat present; pusillus vireo Creek riparian zone.
outside current known failure to detect during range; Preferred habitat is long-term monitoring; dense willow-dominated riparian habitat having a developed understory where nesting occurs. High and low shrub layers are used as foraging substrate.
Charadrius We&stem snowy FT SSC No North Ranch; habitat within current known range Low - There is habitat alexandrinus plover (nesting) limited to one beach area of the coastal beach at the mouth of Coon nivosus at mouth of Coon Creek.
population of this species.
Creek that is above the high tide mark.
Suitability is not optimal due to its small area (<
2 hectares), mixture of sand and gravel substrate and abundant rack debris. Long-term monitoring has failed to identify westem snowy plover at Coon Creek beach.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 11 of 17 Species Common Species Status3 Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Empidonax Willow none SE Yes North Ranch; Willow within historic range and High - Two willow traillii brewsteri flycatcher thickets associated with outside current known flycatchers were Coon Creek riparian breeding range for all detected at Coon Creek zone.
subspecies; habitat consists during the spring of dense willow thickets migration period on along streams and rivers.
April 23, 2005. The timing of these observations suggests that the birds were transient E. t. brewsteri.
Corynorhinus Townsend's big-none
- SCT, No North Ranch and South within current known range; Low - This species was townsendii eared bat SSC Ranches and Parcel P; They occur in various surveyed throughout the Rock features may offer habitats including coastal Diablo Lands in the marginal roosting sites in forests and woodlands. Few early 1990's with the form of shallow rock records occur from coastal negative results.
ledges. However, SLO County. This bat Suitable foraging habitat naturally occurring caves requires caves or suitable occurs broadly; suitable or excavated mine shafts cave analogues for roosting roosting habitat appears are favored by this bat.
and for hibemacula.
somewhat marginal Foraging occurs in wooded north and south of the canyons and over small plant site.
wetland areas.
Antrozous Pallid bat none SSC Yes North and South within current known range; High - Known to occur, pallidus Ranches and Parcel P; many records from San Luis positively identified from oak woodlands and Obispo County. Pallid bats two sites on the South canyons with mature are a crevice roosting Ranch (Pecho Canyon oaks (e.g. Ruda Canyon, species. Common roost and Irish Canyon).
northeast of Green Peak, sites are rock crevices, old and upper Crowbar, Dry, buildings, bridges, caves, Water, Irish, Pecho, mines, and Diablo, and Rattlesnake hollow trees. Often canyons.
associated with oak habitat, particularly lower elevation oak savannah.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 12 of 17 Species Common Species Status3 Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Dipodomys Morro Bay FE SE, SFP No North Ranch near current known range; Low - multiple survey heermanni kangaroo rat some potential habitat results negative present mouth of Coon Creek Neotoma Bryant's none SSC Yes North and South within current known range; High - Known to occur, bryanti woodrat Ranches and Parcel P; found along the Pacific slope positively identified intermedia They occur in coastal region from Baja Califonmia during live-trapping scrub, coastal bluff to San Luis Obispo County.
surveys performed scrub, chaparral, and This woodrat usually lives in north and south of the grassland areas with rock outcrops on slopes with plant site.
rock outcrops.
coastal scrub and chaparral vegetation.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 13 of 17 Species Common Species Status3 Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Bassariscus Ring-tailed cat none SFP No North and South within current known range; Low - absence of astutus Ranches and Parcel P; Ringtails are widely records for the species suitable habitat occurs in distributed in California but from other nearby wooded canyons, more common in the north, locations in the County, chaparral and riparian They occur in forest and and no evidence found zones shrub habitats in rocky areas during surveys and riparian zones. There performed in the early are few records of ringtails 1990's suggest it does from San Luis Obispo not occur on the Diablo County and none from the lands.
coastal area.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 14 of 17 Species Common Species Status' Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Taxidea taxus American none SSC Yes North and South within current known range; High - Known to occur badger Ranches and Parcel P; occurs in a wide variety of based on surveys where local records open, uncultivated habitats, performed on the North occur (North Ranch),
with dry friable soils and Ranch (2006 - 2011).
utilizes open grassland sufficient prey. Prefers areas on the marine habitats such as grassland, terrace for foraging and oak savanna, sparse scrub, for breeding.
and chaparral.
Arctostaphylos Manzanita, FT none No North Ranch near current known range; Low - absence of morroensis Morro habitat not present special habitat elements; sandy soils
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 15 of 17 Species Common Species Status, Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Arenaria Marsh sandwort FE SE No North Ranch near current known range; Low - absence of paludicola habitat marginal special habitat elements; fresh or brackish marsh Astragalus Coastal dunes FE none No North Ranch near current known range; Low - outside known tener titi milk-vetch habitat marginal geographic range; dune habitat lacking
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.4-1 Sheet 16 of 17 Species Common Species Status-Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Cirsium San Luis FE SE No North and South near current known range; Low - absence of fontinale Obispo fountain Ranches; requires special habitat elements special habitat obispoense thistle (aka serpentine springs and lacking (serpentine springs elements; serpentine Chorro Creek seeps not present or seeps) seeps bog thistle)
Dithyrea Beach none ST No North Ranch; mouth of within current known range; Low - absence of madtima spectaclepod Coon Creek usually found on transverse special habitat foredunes, 50-300 meters elements; survey results from the surf negative Eriodictyon Indian Knob FE SE No North and South Ranch; within current known range; Low - multiple survey altissimum mountain balm If present, the plant habitat present, maritime results negative would most likely occur chaparral in polygons of the central maritime chaparral that conincide with units of the Pismo sandstone geologic formation.
Hesperocypari
- Cypress, FT No North Ranch near current known range; Low - multiple survey s goveniana Gowen habitat present results negative
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.4-1 Sheet 17 of 17 Species Common Species Status3 Record of Area(s) of Potential Range/Habitat Occurrence Potential Name Federal State Occurrence Occurrence Assessment Lasthenia Goldfields, FE none No North Ranch, outside current known Low - absence of conjugens Contra Costa range; habitat not present special habitat (vernal pools) elements; vernal pools/alkaline playas Nasturtium Gambel's FE none No North Ranch (Coon near current known range; Low - failure to detect gambellii watercress Creek, Tom's Pond) habitat present during long-term monitoring Piperia yadonii Rein orchid, FE none No North Ranch (ridge top) near current known range; Low - multiple survey Yadon's habitat present results negative Poa diaboli Diablo Canyon none none Yes North Ranch (ridge top) near current known range; High - Known to occur blue grass habitat present in several locations on North Ranch from Crowbar Canyon north along ridge road.
Suaeda California FE none No North Ranch; mouth of near current known range; Low - special habitat califomica suaeda Coon Creek habitat not present requirements not met (salt marsh); survey results negative
- In this context, "Special Status" refers to species listed under the federal and/or state Endangered Species Acts (ESA), species proposed for listing under the federal ESA, species that are candidates for listing under the state ESA, state Fully Protected species, and state Species of Special Concern.
2 - The North Ranch and South Ranch are the more than 11,000 acres of owner-controlled lands lying north and south of the plant site, and outside of Parcel P.
3-Designations used to identify special status of species presented in the table are as follows:
SE - State listed as Endangered, ST - State listed as Threatened, SR - State listed as Rare (plants only), SCE - State candidate for listing as Endangered, SCT-State candidate for listing as Threatened, SFP-State (CDFW) Fully Protected species, SSC - State (CDFW) species of special concern, FE -
Federally listed as Endangered, FT-Federally listed as Threatened, FPE - Federally proposed for listing as Endangered, FPT-Federally proposed for listing as Threatened, FPD - Federally proposed for delisting, DL - Delisted
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.5-1 Sheet 1 of 3 LIST OF FEDERAL THREATENED OR ENDANGERED SPECIES THAT MAY EXIST IN THE VICINITY, OFOCCUR ON THE DCPP SITE OR IMMEDIATELY OFFSHORE.
Class Species Common Name Status1,_ 2 Amphibians Ambystoma califoniense California tiger salamander T
Amphibians Rana draytonii California red-legged frog T
Fishes Oncorhynchus mykiss Steelhead trout (SCCC DPS)
T Fishes Oncorhynchus kisutch Coho Salmon (Central E
California Coast ESU)
Fishes Acipenser medirostris Green Sturgeon (Southern T
DPS)
Fishes Eucyclogobius newberryi Tidewater goby E
Mammals Enhydra lutris nereis Southern sea otter T
Mammals Arctocephalus townsendi Guadalupe fur seal T
Mammals Balaenoptera musculus Blue whale E
Mammals Physeter macrocephalus Sperm whale E
Mammals Balaenoptera physalus Fin whale E
Mammals Megaptera novaeangliae Humpback whale E
Mammals Balaenoptera borealis Sei whale E
Mammals Orcinus orca Killer whale E
Mammals Eubalaena japonica North Pacific right whale E
Gastropods Haliotis cracherodii Black abalone E
Gastropods Haliotis sorenseni White abalone E
Reptiles Chelonia mydas Green sea turtle T
Reptiles Lepidochelys olivacea Olive ridley sea turtle T
Reptiles Dermochelys coriacea Leatherback sea turtle E
Reptiles Caretta caretta Loggerhead sea turtle E
Notes:
- 1. E: Endangered, T: Threatened
- 2. The species' status was updated by PG&E in 2014.
Class species Common Name Status4-2
-alf n
a.f
.ia tiger
- alamand r E
AInphibia~ Ambystoma maGcrdactylm Salamander, Santa Cruz E
Arpii Bfoq mia-roec-,Ga ph us ca nlifo er.Nicu---r-Toad, Arroyo so-uthwestrn Ei A~phb Rana aurora draytonji CaliOfornimared legg eed Ifrog, T
Brcds rhyFrFmphu6smarratu.
Muelet, m.abled T
mafmcwa Bifds Charadrius alexandrinur, nivosue Plo~ver, western snowy T
8ikds Charadrius montanuc Mountain-plcveF
~tIe e4ds L iaonax traiiiii extimus FlyrcatcneF, seurnwcstcr willw Condor, Californi-a_____
Eagle
-baI4___t u&4eq Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Table 2.5-1 Sheet 2 of 3 clas speegle Common NaM, Stat__4__
PidsP canus occidentais PeliGan, bron F-PD Rallus l
.ngir.st... p.
R.il, lih footed r
E E1#4 Rallus long*
l reotri.r ob etu Rail, California clappjr E
Sterna antillaruJm br'o-ni Temleast E
E1#4s
'.iro eilipclu Viree, lest4Bells E-
~ustaeeans Branchinecta longyantonna F
- hFi, hrimp, longhorn E-
.IustaGeas Branchnocta e
'ynchd Fair; Shrimp, Vern.al po,:
ishes EucYclogobius newberrYi Geby, tid-ew.at-eF E
Fisher.
Gasterosteus aculeatus Stickloback, unarmored E
W14iamsen thre-spig F46hes Oncorhynchu&4mykirss tcha trout T
Inseots Euphilotes enoptro
-mitli Butterfly Smith'-,lo-E UW"G p.r" pinu..euterpe Moth...,
Tr".....
Mamm~rals rtcphalusm townsend Seal, Guadulupo fu T
v
.. f v
vr.G
- vSv.-.-,--
v--
Mammals Dpdry eran Kanmgaroo rat, Morro Bay E
Mammals..
.podo..s io.....
rt
.gian E
M..am.mals ipodo...
nitraoid.
,an.a. o rat, Tip...
7............
-.,*.,..v i~,
Mammals Enhydra-
1=lutQri neis' I
Otter, Southern sea-T Mammals Rorex ornatus Fe!ictUs Bue-n;; Nit LarnI;ke ornate E
______shrw Mammals Vulpee m t1-Fox, San Joaguinki E
Pla..s Arabis., h.ffmannii Rock cress, Hoffmann'.
E Plants Arctostaphylos confertiflor AManz-anita, Santa Rosa E
______Islnd Plants ArtOstaphylo.s mfr-rmesis Manzanita, Moro T
Plafts Aren~aria paludicola Marsh sandwert.
E
- Plants, Astragast*n-*ner tittMarsh sandwLrct E
Plants Berberis pinnata isarsBbey-lndE Plafts Gastilleja melmlism Paintbrush, sf ovdE Ptlants Caulanthis caWifRnicus Californa jewelf loweF E
ants Ch*oog.a...
pp T
7 r"...
v Plants hoiatpugnpuen pef-oeMnee Plants Chori.anthe rbusta Spn*eflower, RIbust E
Plants Cirsiurn fontinale fontinale Fountain thw E~
Plants CirsiuM fontRinale oispoensee T-histle, Chorro Crock bog E
Plants Cirsium loncholepis Thisbtle, La Graciosa E
Plants Clarka socioca imaculate Clarkia, Pismo E
Plants 7a v7 nas..fFnU S-Salt mars.....h b*.d's beak E
rA,,ts lGUPFeSpI ft Gyp,;ps.
G e
1 Plants Dudleya-cyme;.sa m;arZescens Duidl-ya, MarcoScent T
Plants Dudleya nesi, tica Li.el -Fevr, Santa Cruz T
_l.
- Island Plants D)udleya--setchel'ii San~ta lr
.alyduly Plants DdeaFsi Santa B3arbara Wsand E-Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Table 2.5-1 Sheet 3 of 3 Class Spews Co.mmoA Name Status_-_
_ _ _efer-Geve_
Plats Eremaiche kornensis Ke-mallow E
Plants EriaStumn hooer:-
Hoover's wol strT RPlats Eriodicstyon altsivmum Moeunta~inbalm, Indian Knob E-plafts Erioedictyon capitatum Yorba santa, LomApoG E
Plants Erfimummozis MenZies'6 mWalflo-wer E-Pl*nft Galium buivolium Bedstraw, island Planft Gilia tenumifloira arnraMonte Hy~imi Plants Gili tomnuifloAF hoffmRAnn GiaHomann's E
Plants Hemzo*nia.
,.,r..c.n
.,,;no Tar:':ed, Ga'-ota E
Plarts HoGocarpha Facadenia T-arweed, Santa Cruz T
Plafts Lasthenia cnejugenis Goldields, Contra Costa E
Pant Lay" a-.amesa.
geaeh-layia E
Plants Lembertia cOngdomi San Jogi iol;tras E-Plafts LupinusA nip onsi E
Plants Lupigus tidestromii C-lev er~i~le E-Plants Mlohansf sciuatus Busmh-mallowm, Santa Cruz E
neslaticu island Plants MalacothriX idcr MaleoothriX, Santa Cru SIslandV Plafts Malacothri squalida MAURoco-thrix, island E
Plants Navarrotia leucocephala Navarretia, few flowAered-PlantsP reta h u
'-'lc NaVarrftia, many flower=
E Plants Opunt4Fia-tRelA-si Bakorrfipld cactus
- r".
Plants Parv~odurn leicar-um R-tonecrop, Lake County E-PlIats Phacelia nuaisnuaisPhacelia northern island E-Planft Pl~e&ia yadei Rper-ia, Yaden's E
Plants Po0tfentillaR 140kmanij.
Cnefol Hickan' E-Plants Rorippa gam-bellii G ambol'e" s w oa teA-rcnres rs E
Plants Suaeda californica Seablite-CGalfomnia Plants Thyranocarpur-Gonchulifru Fringopod, Santa Cruz E-S~Island Plants T-rifoli*um trichocalyx Clover, Del Monte E____
Rete Ghelenia-m~ydas TFutle, geen sea-T Rep Gambhelia A-*u Lizard, blunt nosed leopard E
R"e Gopheu agsii Tortoise, desert R-e Lepidochelys olivacea Turtle, olive ridLoy T
Reptiles Xantusia riversiana Hlminthe
- nan Lizard, island night
[ Snail, Morro rshoulderband I
E-Notes*
1_ E Endr.nnered_
federal oronFoed for delistiAn (Feb 200Q(.
- 2. The species' status wa updated by PG&E in 200&.
Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 TABLE 2.6-1 POPULATION TRENDS OF THE STATE OF CALIFORNIA AND OF SAN LUIS SANTA BARBARA COUNTIES OBISPO AND Year 1940 1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 State of California 6,907,387 10,586,233 15,717,204 19,953,134 23,668,562 29,760,021 33,871,648 39,135,676 37,253956 44,135,923 40,643,643 49,249,891 44,279,354 54,266,115 47,690,186
- 9507876 50,365,074 San Luis Obispo County 33,246 51,417 81,044 105,690 155,345 217,162 246,681 269,734 269,637 293,540 287,744 316,613 311,349 338"760 328,677 364,748 338,808 Santa Barbara County 70,555 98,220 168,962 264,324 298,660 369,608 399,347 434497 423,895 449,505 484,670 473,356 509,920 492,610 534,447 506,466 Notes (a)
(a)
(a)
(a)
(a)
(a)
(a)
(ba)
(b)
(b)
(b)
(b)
Notes:
(a)
(b)
U.S. Census Bureau (References 74 and 144)
Population Projections by State of California Department of Finance (Reference 73)
Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 TABLE 2.6-2 MINORITY AND LOW INCOME POPULATION INFORMATION Total Block Groups Within 50 American Indian or Alaskan Native Hawaiian or Pacific All Other Single Multi-Racial Aggregate of Minority Hispanic Low-County Miles Native Asian Islander Black Minorities Minorities Races Ethnicity Income Kern 1
0 0
0 0
0 0
1 1
0 Monterey 2
0 0
0 0
0 0
0 0
0 San Luis Obispo 460162 0
0 0
02 0
0 812 810 01, Santa Barbara 4-34132 0
0 0
0 07 0
5677 4360 Total 4-94297 0
0 0
02 07 0
6590 6271 4-122 State Averages 0-.0.8%
4"-0413.1%
0"0.4% 6&46.1%
0413.9%
2-73.9%
6359.3%
32-.437.2%
1-04&1.4%
Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 TABLE 2.7-1 PROPERTY TAX BREAKDOWN FOR 2004-20082014 SLO County Property Tax paid Percent of SLO Year Property Tax by DCPP County Property Revenues (Millions)
(Millions)
Tax Revenues 2013-2014 430 25.6 6.0%
2012-2013 417 26.4 6.3%
2011-2012 413 25.4 6.2%
2010-2011 420 25.0 6.0%
2009-2010 424 24.5 5.8%
2008-2009 425 22.3 5.6%
2007-2008 404 20.7 5.6%
2006-2007 371 20.1 5.8%
2005-2006 334 21.4 6.3%
2004-2005 301 20.4 6.6%
Source: References 78, 79, 80, 81, 82, and 83, 147, 149, 150, 151, and 152.
Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I TABLE 2.8-1 HOUSING STATISTICS FOR SAN LUIS OBISPO AND SANTA BARBARA COUNTIES 1990 2000 2010(a)
Percent Change San Luis Obispo County Total Housing Units 90,200 102,275 117,315 14.74-1-8 Occupied Units 80,281 92,739 102,016 10.01-3.4 Vacant Units 9,919 9,536 15,299 60.4-3-9 Median House Value ($)
213,200 230,000 449,300 95.37-.3 Santa Barbara County Total Housing Units 138,149 142,901 152,834 7.03.3 Occupied Units 129,802 136,622 142,104 4.0"o Vacant Units 8,347 6,279 10,730 70.9-24.
Median House Value ($)
249,200 293,000 482,400 64.644-ý (a) Median house value is not available for 2010. Data is for the period 2008-2012.
Source: References 89 and-90, 144, and 182 Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I TABLE 2.9-2 Page 1 of 3 CURRENT AND FUTURE - ROADWAYS LOS CLASSIFICATIONS Current Future (2025)
Road/Route (Class)
ADT LOS*
Peak Hr ADT LOS Peak Hr Avila Beach Drive (Collector 13,495 ED 1,562 15,537 F
1,798
- 2 Lanes)**
40467 4-739 42-,&9 4-;69 San Luis Bay Drive 7,460 BA 806 8,589 A
928 (Collector - 2 Lanes) 6T532 625 77948 76 Sheg" -eanhOntario Road 1,620 A
232 1,865 A
267 (Collector - 2 Lanes) 47945 429 6-04-7 522 Los Osos Valley Road 14,563 D
1,328 16,767 F
1,529 (Arterial - 2 Lanes) 46T15" 4-,673 20460 20336 Diablo Canyon Road 1,800 A
180 1,800 A
180 (Collector - 2 Lanes)
Pecho Valley Road 3,217 A
301 3,704 A
347 (Collector - 2 Lanes) 4454-2 8
,1-7440 24 Traffic on Highway 101 at s ecified exits Major - 4 Lanes)
SLO County Jct. Rte. 166 50,100 CD 5,400 57,683 CF-6,217 East 627000 6-400 79,542 7-7-88 Teftt St.
50,600 C
5,100 58,258 DG 5,872 51000 4-50 54o445 5,476 Los Berros Rd.
50,100 C
5,500 57,683 C
6,332 477-00 54,45 57-749 Arroyo Grande, Bridge St.
44,700 BG 5,400 51,465 C
6,217 f0006700 5A4,45 7-7304 Arroyo Grande, Jct. Rte.
50,600 CB 6,100 58,258 DB 7,023 227 North, Grand Ave.
44,700 5-500 474,67 6T692 Arroyo Grande, Brisco Rd.
54,200 CR 6,500 62,403 DR 7,484 464000 5-7-00 487065 6,936 Pismo Beach, Oak Park Rd.
60,100 DG 7,300 69,196 EG 8,405 5-1-70=
6-,400 531-056 717788 Pismo Beach, Pismo Oaks 67,400 DG 9,000 77,601 FP 10,362 587000 7-400 607047 0-004 Pismo Beach, So. Pismo 61,900 D
7,000 71,268 E
8,059 Beach (Villa Creek) 667000 8-400 70,204 40-224 Pismo Beach, Jct. Rte. 1 64,400 DG 7,500 74,147 FD 8,635 South 655700 9,400 664925 4-0,22 North Shell Beach 66,700 DG 7,400 76,795 FD 8,520 5 5,7000 47750 667925 617-80 Avila Rd.
65,300 D
7,100 75,183 FE-8,175 S 627000o40 7-,660 0-,494 North Avila Rd./San Luis 68,100 EG 7,200 78,407 FF-8,290 Bay Dr.
567000 67900
&7&084 67396 Santa Fe 63,300 DE-6,500 72,880 EP 7,484 697000 89300 I
8948 404-00 San Luis Obispo, Los Osos 58,700 DE 5,900 67,584 EF 6,793 Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 TABLE 2.9-2 Page 2 of 3 Current Future (2025)
Road/Route (Class)
ADT LOS*
Peak Hr ADT LOS Peak Hr Rd.
697000 87000 403,84 93-,5-San Luis Obispo, Madonna 67,100 DG 6,700 77,255 FE-7,714 Rd.
54,00
&750 72-240 76692 San Luis Obispo, Jct. Rte.
62,300 DF 6,200 71,729 EF-7,138 227 So., Marsh St.
7-&=
87600 40n,7247
,4.,465 San Luis Obispo, Jct. Rte. 1 54,800 CE 5,400 63,094 DF-6,217 North, Osos St.
7--17000 8-000 97-,7-66 90735 San Luis Obispo, California 44,800 BD 4,400 51,580 CF 5,066 Blvd.
62700 7--1=
86,343 8751-8 San Luis Obispo, Grand 37,600 BG 3,700 43,291 BF-4,260 Ave.
54,40 87000 777095 7-3 0 San Luis Obispo, Buena 43,800 B
4,300 50,429 CG 4,951 Vista 44-10 4600
&T747-5 89 San Luis Obispo North City 43,800 B
4,500 50,429 CD 5,181 Limits 487500 87300 62,299 67449 Jct. Rte. 58 East, Santa 41,400 B
4,100 47,666 BG 4,721 Margarita Creek 407500 4-=300 54-7U 87-2 Atascadero, Santa Barbara 44,000 B
4,400 50,659 C
5,066 Rd.
387500 44 5 49884 87050 Atascadero, Santa Rosa, 47,900 B
4,800 55,150 C
5,526 Rd.
40500 4450 5473 5-45 Atascadero, Curbaril Ave.
51,800 Ca 5,200 59,640 DG 5,987 447NO0 4765-0 547252Q 86586 Atascadero, Jct. Rte. 41 56,900 CB 5,700 65,512 DG 6,563 41-500 4-550 5472521 5,537 Atascadero, Traffic Way 57,700 C9 5,800 66,433 DG 6,678 44750 47900-557480
&o962 Atascadero, San Anselmo 55,800 CB 5,500 64,245 D
6,332 Rd.
477000 54,-00 62562 6206 Atascadero, Del Rio Rd.
56,700 C8 5,900 65,281 DB 6,793 4200 47-500 464,350 5T47-6 San Ramon Rd.
58,400 DO 5,800 67,239 EB 6,678 427000 47450 4875 5-445 Templeton, Vineyard Dr.
53,400 CB 5,300 61,482 DG 6,102 447000 47550 50,844
&1o&W Templeton, Los Tablas Ave.
53,100 Co 5,300 61,137 DG 6,102 427000 37900 51703 4,746 Templeton, Main St.
49,500 B
5,000 56,992 C
5,757 427000 37900 54-632 4-,746 Jct. Rte. 46 West 60,500 DB 6,100 69,657 EG 7,023 44,500 3-7-50
&704115 4-56%3 South Paso Robles 36,600 B
3,700 42,139 BD 4,260 495,00
,800 638,22-7 7-05" Paso Robles, 13'h St.
33,300 B
3,300 38,340 B
3,7991 Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 TABLE 2.9-2 Page 3 of 3 Current Future (2025)
RoadlRoute (Class)
ADT LOS*
Peak Hr ADT LOS Peak Hr 337500 3
4404 4,78N Paso Robles, Jct. Rte. 46 21,600 A
2,500 24,869 A8 2,878 East 2070 3-450 36 4,4-98 Paso Robles, North Paso 22, 600 A
2,600 26,020 AS 2,994 Robles 1
24-6W 2450 3-1*389 2764-6 Notes: *LO5 calculated using Santa Barbara County thresholds or LOS developed specifically for the Avila Beach ama,-ighway apa.ity S.ftw:Fr..
ADT=Average Daily Traffic, LOS=Level of Service, Peak Hr=Peak hour
- LOS for Avila Beach Drive based on peak heeur-season (summer) numbers.
Percent growth based on 4-81.130/o annual population growth pfedk*ed-for the state of California, which is comparable to San Luis Obispo County's 1.409% growth rate between 1990 and 2000-2010 (Reference 03144).
Sources: Highway 101 =CalTrans, 20012012; Avila Beach Roads=San Luis Obispo Traffic Volumes, 20:22012--,whiGh Rn R
Orn R9 R
Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I TABLE 2.9-3 SAN LUIS OBISPO COUNTY SCHOOL DISTRICT STATISTICS Number of Number of Student to School Districts City Schools Students Teacher Ratio Atascadero Unified Atascadero 12 4,9045-0=
22.82-0:6 Cayucos Elementary Cayucos 1
223242 17.847-.4 Coast Unified Cambria 5
745862 15.64-6 Lucia Mar Unified Arroyo Grande 181-7 10,5884-0N,66 23.720" PasoRobles Joint Unified Paso Robles 1342 6, 7476,-N5 23.320-5 Pleasant Valley Joint Union San Miguel 1
1151-37 23.01-7-4 Elementary San Luis Coastal Unified San Luis Obispo 1746 7,3507-241 19.44-9 San Luis Obispo Co. G"A Paso Robles 4
204 9
San Luis Obispo Co. Off. of San Luis Obispo 4
640765 16.84-24,6 Education San Miguel Joint Union San Miguel 32 610454 19.74-7-4 Elementary Santa Lucia ROP Arroyo Grande 1
N/AN/A N/AN/A Shandon Joint Unified Shandon 4
304384 15.844-2 Templeton Unified Templeton 87 2,2942-5 23.0214 N/A = Information not available.
Source: Reference 95 and 183 Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I TABLE 2.10-1 ATTAINMENT STATUS OF SLO COUNTY, ALL MONITORING STATIONS Air Basin 03 CO NO 2 SO2 PM2 5.
PM10 State Fed State Fed State Fed State Fed State Fed State Fed SLO N
Ul/A A
Ul/A A
U/A A
U A
U/A AN U
County I
I Notes: A=Attainment of Standards; N=Non-Attainment; U=Unclassified; U/A=Unclassified/Attainment Source: Reference 96, Last updated February 2, 2009June 2013.
Diablo Canyon Power Plant License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Environmental Report Diablo Canyon Power Plant Figure 2.3-1 Onsite Monitoring Well Locations
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT t I6 Cl I
1977 1983 1989 1995 2001 2007 2013 1980 1986 1992 1998 2004 2010 Survey Date Annual average densities of black abalone (# per M2) (heavy black line with diamond symbols) and average monthly seawater temperatures (lighter line without symbols) from Thermal Effects Monitoring Program (TEMP) studies. The vertical lines off the x-axis represent the occurrence of large waves during February 1983 (black line), the start of DCPP commercial operations for Unit 1 in May 1985 (blue line) and Unit 2 in March 1986 (green line), and the discovery of WS in Diablo Cove (red line). The abalone data were from intertidal horizontal band transect sampling of 30 m transects at two tidal elevations (+0.3 m and +0.9 m MLLW), except from the South Diablo Point area where all transects were located at the +0.9 m MLLW tidal level. The count data on black abalone from the ten m2 quadrats sampled at each transect were averaged for each survey and then the survey averages from all of the transects for each sampling area were averaged for each year. The temperature data were collected from instruments situated at the +0.6 m tidal level in each of the areas. The data were corrected to remove all of the data collected when the instruments were out of the water during periods when the tide was below the +0.6 m tidal level.
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1
!R Pacific Gas and Electric Company L
Aggregate Mkir BEock Group IV
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Or Resemrin 0 ais is 39
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Wmhe or Reservoors PacIifi Gas and In Eectric Company lkd Sd.
a d f-u-O U I
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Figure 2.6-3 Low-income Populatons
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I
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4 J
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I Other Minority Pouations I
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I I)i/
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APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I
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40 70" omlW 14 onII"4-DK Environmental Report Diablo Canyon Power Plant Figure 2.8-1 Land-Use Map
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I N
051 A
t Um pr~mdsn a"d am: MS I4 UTM Zon ION,1:U0 I
I Faults In the DCPP Vi.inity asumm
. POAE (ISIS 2011. SH3,2014)
- Rooena-I bls apvd~ map m4*m Hnasn
. (2004)
-AMEC (2011)
- ~ ~~~a Dr a
up~
EM, vandui 7 (DCPP Gnaas. 2*13)
ENVIRONMENTAL REPORT PFdume-o conyi FiWr" 2.13-8
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 CHAPTER 3 - THE PROPOSED ACTION NRC
"... The report must contain a description of the proposed action, including the applicant's plans to modify the facility or its administrative control procedures..." 10 CFR 51.53(c)(2)
Pacific Gas and Electric (PG&E) proposes that the U.S. Nuclear Regulatory Commission (NRC) renew the operating licenses for Diablo Canyon Power Plant (DCPP) for an additional 20 years. Renewal would give PG&E and the state of California the option of relying on DCPP to meet future electricity needs. Section 3.1 discusses the plant in general. Sections 3.2 through 3.4 address potential changes that could occur as a result of license renewal.
3.1 GENERAL PLANT INFORMATION DCPP is a nuclear-powered steam electric generating facility that began commercial operation on May 7, 1985 for Unit 1 and March 13, 1986 for Unit 2. Each unit is powered by a Westinghouse pressurized water reactor (PWR). Unit 1 produces a reactor core power of 3,411 megawatts-thermal; Unit 2 produces 3,411 megawatts-thermal. The design net electrical capacities are 1,138 and 1,147 megawatts-electric for Units 1 and 2, respectively. Figure 3.1-1 depicts the site layout.
The following subsections provide information on the reactor and containment systems, the cooling and auxiliary water systems, and the electric transmission system.
Additional information about DCPP is available in the following documents:
Final Environmental Statement (FES) for operation of the plant (Reference 2),
Generic Environmental Impact Statement for License Renewal of Nuclear Plants (Reference 3), and DCPP's Final Safety Analysis Report Update (Reference 1).
3.1.1 REACTOR AND CONTAINMENT SYSTEMS The nuclear steam supply system at DCPP is a four-loop Westinghouse pressurized water reactor. The reactor core heats up to approximately 581 OF. Because the pressure exceeds 2,000 psi, the water does not boil. The heated water is pumped to four U-tube heat exchangers known as steam generators where the heat boils the water on the shell-side into steam. After drying, the steam is routed into the turbines. The steam yields its energy to turn the turbines, which are connected to the electrical generator. Both Unit 1 and Unit 2 steam generators were replaced in 2008 and 2009 by new Westinghouse steam generators (Reference 4). The nuclear fuel is low-enriched Diablo Canyon Power Plant Page 3.1-1 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I uranium dioxide with enrichments 5 percent by weight uranium-235 or less and fuel "
burnup levels of a batch average of approximately 49,000 megawatt-days per metric ton of uranium (MWD/MTU), and less than a maximum of 62,000 MWD/MTU.
The reactor, steam generators, and related systems are enclosed in a containment building that is designed to prevent leakage of radioactivity to the environment in the improbable event of a rupture of the reactor coolant piping. The containment building is a reinforced concrete cylinder with a slab base and hemispherical dome. A welded steel liner is attached to the inside face of the concrete shell to ensure a high degree of leak tightness. In addition, the 3.6 ft thick concrete walls serve as a radiation shield for both normal and accident conditions.
The containment building is ventilated to maintain pressure and temperatures within acceptable limits. The containment ventilation system can also purge the containment prior to entry. Exhaust from the ventilation system is monitored for radioactivity before being released to the plant vent. High efficiency particulate air (HEPA) filters can be used when needed to filter the air before releasing it. The containment building can be isolated if needed.
3.1.2 COOLING AND AUXILIARY WATER SYSTEMS The water systems most pertinent to license renewal are those that draw from surface water bodies and groundwater. At DCPP, the once-through cooling (OTC) Circulating Water System draws from and discharges to the Pacific Ocean. The system removes the heat rejected from the main condensers.
A seawater reverse osmosis treatment unit provides the majority of freshwater for plant primary and secondary systems makeup, fire protection system source water, and plant domestic water system supply. The unit is supplied with raw seawater drawn from the power plant OTC system intake, and has the capacity to produce 450 gpm of freshwater. Groundwater from an onsite deep well is also available to supplement freshwater supply as necessary. Supplement of reverse osmosis system supply by the deep well is generally only required during equipment maintenance periods, or during plant start-up following refueling or forced outage when freshwater consumption is significantly increased.
3.1.2.1 Surface Water Condenser circulating water is seawater from the Pacific Ocean. The ocean water level normally varies between zero and +6 ft mean lower low water (MLLW) datum. Mean sea level (MSL) zero is equivalent to +2.6 ft MLLW.
A curtain wall at the front of the intake structure limits the amount of floating debris entering the intake structure. Bar racks near the front of the intake structure intercept large submerged debris. The bar racks have 3/8 inch thick bars at 3-3/8 inch centers.
Diablo Canyon Power Plant Page 3.1-2 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Traveling screens intercept all material larger than the screen mesh opening (3/8 inch clear square openings).
The total flow in each Unit's circulating water system is nominally 867,000 gpm, which is pumped by two circulating water pumps with motors cooled by an air-to-water heat exchanger. The cooling water is provided from the fire water system via a small demineralizer. Each pump has a discharge isolation valve and bypass line around the valve. Approximately 4,000 gpm of the circulating water flow is used per Unit to cool the service water heat exchangers and 1,000 gpm to cool the pump motor cooling water.
Once Through Cooling System DCPP utilizes an OTC water system whereby seawater is drawn from the Pacific Ocean through a shoreline intake structure, and discharged back to the Pacific Ocean at a second, separate, shoreline location. Ambient temperature seawater is pumped through heat exchanging steam condensers located in the turbine building. Figure 3.1-2 provides a diagram of the OTC system (not to scale). Each Unit utilizes an independent cooling system, however the systems share common intake and discharge structures.
The two main steam condensers for each Unit are in-line directly under the low pressure turbine exhaust. Each condenser consists of two halves with each half independently supplied by one of the 2 intake conduits. Each Unit has two intake seawater conduits that split under the turbine building, and supply one half of each condenser. This configuration provides four distinct condenser quadrants per Unit, with each seawater conduit supplying cooling flow to the inlet of two condenser quadrants.
Individual condenser quadrants contain 58,126 1-inch diameter 41-ft horizontal titanium tubes that provide a large surface area for efficient heat transfer between secondary side turbine steam exhaust and the seawater cooling flow. Following transfer of waste heat, the warmed seawater is discharged back into the ocean through the shoreline outfall located at Diablo Cove. Condensed water on the secondary side is re-circulated to the stream generators and flashed back to turbine steam.
Seawater Intake System For each Unit, two main seawater circulating water pumps (CWP) provide cooling flow to the main condenser inlets. Each CWP discharges into a concrete conduit approximately 1,800 ft in length that rises from the shoreline intake structure to the turbine building. The conduits measure 11.75-ft square with exception of an initial tapered section leading directly from the pump discharge, and a circular section used for flow monitoring. The CWPs produce a combined rated flow for Unit 1 between 778,000 gpm and 854,000 gpm, and for Unit 2 between 811,000 gpm and 895,000 gpm.
Two-Unit combined flow is between 1,589,000 gpm minimum and 1,749,000 gpm maximum during normal plant operations.
Each Unit also has two auxiliary saltwater system (ASW) pumps that supply cooling flow to the safety related component cooling water (CCW) heat exchangers. Each ASW pump is rated at 11,500 gpm. During routine plant operations, only one ASW train is in Diablo Canyon Power Plant Page 3.1-3 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 use for each Unit, with the second pump in standby mode. Two operating pumps contribute an additional OTC flow of 23,000 gpm. Using maximum pump ratings, total OTC flow during routine full power operations is 1,772,000 gpm, equivalent to 2.55 billion gallons of seawater circulated per day.
Seawater transit time through the power plant is approximately 5 minutes. At full power, cooling flow temperatures are elevated approximately 20°F during condenser pass-through. Average aggregate power plant discharge temperature is 19.6°F above ambient intake seawater temperatures (AT). Temperature elevation can vary in response to ocean ambient temperatures, Unit power levels, plant transients, and planned Unit curtailments which may be accompanied by seawater circulator clearance.
During the initial license period, OTC system discharge AT has been limited by permit to 22°F above intake ambient temperature.
The shoreline intake structure for Units 1 and Unit 2 house the CWPs, vertical debris bar racks, vertical traveling water screen mechanisms (3/8 inch mesh screens), and associated screen rotation and washing equipment. Figure 3.1-3 provides a scaled diagram of the Unit 1 main and auxiliary circulator pump bays, and layout of the debris control and screen wash equipment. Each main circulator draws from an isolated pump bay. Each pump bay is open to the ocean through 3 individually gated 11-ft wide rectangular passages leading through 10-ft wide (nominal) perpendicular vertical traveling screens. Each screening mechanism provides approximately 300 square feet (sq-ft) of filtration area at mean sea level for a total of approximately 900 sq-ft for each CWP. The isolation gates for an individual pump bay can be closed and sealed, and the bay dewatered for maintenance or inspection activities independent of the other bays.
The two ASW pumps for each Unit are serviced by a single 6-ft wide rectangular concrete passage leading through 5-ft wide (nominal) perpendicular vertical traveling screens. The screening mechanism for the auxiliary pump bays provides approximately 150 sq-ft of filtration surface at mean sea level. Leading from the common debris screened inlet passage; the bay then widens and is partitioned into two sides, one for each ASW pump suction inlet.
Unit 1 and Unit 2 intake configuration is mirrored, with the auxiliary pumps and associated bays located near the center of the intake structure. The structure is flat-faced, with all bar racks, dewatering gates, and traveling screen systems installed parallel to the shoreline, and perpendicular to the inlet flow. Total equipment inventory includes 4 CWPs and associated inlet bays, 4 ASW pumps and 2 associated partitioned inlet bays, 14 individual vertical traveling screen wash systems, and 14 bar rack Units installed in front of each traveling screen inlet passage. Figure 3.1-4 provides a scaled cross sectional view of an inlet passage. An additional 9-ft wide bar rack bay serving as a fish escape route is provided at each end of the intake structure bringing the total number of bar rack units to 16. A central concrete partition supporting a screen wash debris collection sump splits the submerged face of the intake into distinct Unit 1 and Unit 2 openings to the ocean environment. The partition is open between the Units Diablo Canyon Power Plant Page 3.1-4 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I behind the bar racks. The opening provides for free flow of seawater and a migration route for fish from one end of the structure to the other.
Cooling System Debris Intrusion Control During routine operations, the traveling water screens are rotated and washed by high pressure saltwater spray for 15 minutes every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. In high energy ocean swell events, and/or periods of increased source water debris loading conditions, the traveling screens can be placed into continuous operation at either low or high speed.
The traveling screen wash system spray nozzles discharge into sluiceways located on the intake structures exterior upper deck. The sluiceways flow to a central refuse collection sump. The sump is dewatered by pumping systems capable of transferring high percentage solids laden flow. The saltwater screen wash effluent and entrained debris is pumped from the sump to a discharge outside of the power plant intake cove.
Grinding and mincing equipment installed in the inlets of the refuse sump process debris captured by the traveling screens and subsequently washed off. The debris grinders reduce potential for clogging of the sump when seawater inlet flow is laden with significant quantities of ocean debris (primarily kelp and under story algae). Entrained debris smaller than the 3/8-inch screening mesh passes through the cooling system.
Cooling System Heat Treatment The main condenser OTC system was initially designed for heat treatment to control marine fouling organisms. Heat treatments, effective for management of biofouling primarily caused by mussels, was implemented but discontinued early during the initial license period. Heat treatments were found to be ineffective at managing acorn barnacles (Megabalanus tintinnabulum), the primary seawater systems fouling problem.
Heat treatment of seawater systems will not be used in the license renewal period.
Discharge and Thermal Effluent Heated discharge from the main condensers of each Unit combine and flow to a common structure terminating in a shoreline outfall. The discharge for Unit 1 and Unit 2 are parallel within the structure separated by a central concrete partition. Cutouts exist in the dividing wall to promote mixing of thermal effluent between the operating Units.
The mixing also provides dilution and reduction of residual oxidants from seawater inlet systems chemical treatments. Figure 3.1-5 provides a side view of the discharge structure and associated cascading weir system.
Discharge flows by gravity from the elevated turbine building into the outfall structure.
Within the structure, flow passes over three weirs and across horizontal platforms fitted with vertical impact blocks. The cascading effect of the design creates mixing of the thermal effluent as well as dissipation of hydraulic energy. Width of the discharge flow out the mouth of the structure is 27.5 ft per Unit. Once discharged, the thermal effluent mixes with the receiving water and dissipates across the ocean surface.
Diablo Canyon Power Plant Page 3.1-5 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Cooling System Biofouling and Chemical Control The seawater conduits are susceptible to colonization by entrained marine organisms.
During the initial operating license period, concrete conduit surfaces in both the intake and discharge systems have been susceptible to extensive fouling with acorn barnacles (Megabalanus tintinnabulum), gooseneck barnacles (Polycipes polymerus), and to a lesser extent mussels (Mytilus edulis). Other marine species also find habitat among the protective substrate created by the primary hard-shelled fouling organisms.
Heavy colonization and growth in the condenser inlet conduits can result in sloughing of fouling material. Individual acorn barnacles or clusters of smaller barnacles, with hard durable calcareous shells larger than 1 inch in diameter, can impinge on main condenser tube sheets and block flow. Sloughed fouling material accumulates on inlet tube sheets resulting in increased backpressure on the intake main circulating water pumps, and reduction of condenser performance. Significant fouling requires manual removal of growth during refueling outages. Mid-cycle Unit curtailments are also often necessary to conduct conduit cleanings and/or perform main condenser inlet debris removal when fouling slough and subsequent tube sheet occlusion become significant.
The chlorination system provides chemical treatment of the circulating water to control the macro and micro fouling in the intake tunnels, piping, and the condenser tubes. The system is used as needed. Liquid sodium hypochlorite and a supplemental chemical, sodium bromide, are stored in tanks at the intake structure (common to both Units).
Adequate valving is provided for isolating any of the tanks from the system. Each tank is within a secondary containment tank sized to contain the entire contents of the storage tank. When chlorination is required (based on a time schedule), the chemicals are injected via metering pumps and injected into the intake structure.
Chemical treatment to inhibit initial colonization of seawater conduit surfaces, as well as retard growth rates of established fouling, will continue to be used during the period of extended operation. Biofouling inhibition coatings are also used within the seawater systems, however, such coatings are not entirely effective, nor can be successfully applied to all equipment surfaces susceptible to fouling.
3.1.2.2 Groundwater Groundwater reserves at the site are limited by the nature of the plant location, and lack of hydraulic connection with groundwater resources on properties outside of plant controlled lands.
DCPP has one active permitted deep well (Deep Well #2) located south of Diablo Creek in the Diablo Mesa area. This well supplies water to the makeup water system, which includes supplying the Raw Water Storage Reservoir used primarily for fire water and domestic drinking water. This well is permitted through the San Luis County Health Department. Until 2008, two adjacent Ranney wells were available to collect excess water runoff from Diablo Creek. The Ranney wells have been abandoned. Conveyance piping and associated pumps were removed. A refurbished Ranney well system, or any Diablo Canyon Power Plant Page 3.1-6 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I other system capable of drawing from Diablo Creek surface waters, will not be installed or used in the future in accordance with the provisions of the Coastal Development Permit for the Replacement Steam Generator Projects conducted during the current licensed period.
Deep Well #2 has a maximum capacity of 170 gpm, and a tested reliable production rate of 150-155 gpm that can be maintained even during drought conditions without depleting the taped aquifer. However, the well is not intended to operate continuously, and is only in-service as needed. Average production from the well on an annual basis is projected to be significantly less than 100 gpm during the period of extended operation. The estimate for total well use is approximately 2 weeks (or approximately 350 hours0.00405 days <br />0.0972 hours <br />5.787037e-4 weeks <br />1.33175e-4 months <br />) on average per year at the 150 gpm production rate.
Deep Well #2 will normally only be used in the event the Seawater Reverse Osmosis (SWRO) Unit freshwater production is insufficient to maintain plant makeup or firewater reserves or in the event that water conditioning of the SWRO product water is required.
This is anticipated to occur only during a non-routine period of unusually high freshwater consumption by Unit 1 and/or Unit 2 (such as an extended dual unit forced outage with Units maintained in hot standby), or during periodic planned or unplanned clearance of the SWRO. SWRO supply is generally only insufficient when the system is unavailable for an extended period of time due to scheduled equipment maintenance, an unplanned equipment failure, or a system trip from a transient event such as electrical power loss or excessive pump backpressures. Continuous use of the well at maximum rated capacity is therefore not anticipated during the period of extended operation. The system will remain a back-up freshwater resource, and be used only infrequently.
3.1.3 RADIOACTIVE WASTE TREATMENT PROCESSES DCPP uses liquid, gaseous, and solid waste processing systems to collect and treat, as needed, radioactive materials that are produced as a by-product of plant operations.
Radioactive materials in liquid and gaseous effluents are reduced to levels as low as reasonably achievable.
Radioactive material in the reactor coolant is the source of most liquid, gaseous, and solid radioactive wastes in light water reactors. Radioactive fission products build up within the fuel as a consequence of the fission process. The fission products are contained within the sealed fuel rods; however, small quantities of radioactive materials may be transferred from the fuel elements to the reactor coolant under normal operating conditions.
Reactor fuel assemblies that have exhausted a certain percentage of their fissile uranium content are referred to as spent fuel. Spent fuel assemblies are removed from the reactor core and replaced by new fuel assemblies during routine refueling outages.
The spent fuel assemblies are then stored for a period of time in the spent fuel pool and may later be transferred to dry storage at an onsite Independent Spent Fuel Storage Diablo Canyon Power Plant Page 3.1-7 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Installation. DCPP also provides onsite storage of mixed waste, which contain both radioactive and chemically hazardous materials.
Storage of radioactive materials is regulated by the NRC under the Atomic Energy Act of 1954, as amended, and storage of hazardous wastes is regulated by the EPA under the Resource Conservation and Recovery Act of 1976.
Systems used at DCPP to process liquid, gaseous, and solid radioactive wastes are described in the following sections.
3.1.3.1 Gaseous Waste System The Gaseous Radwaste System (GRS) is designed to process radioactive gases consisting primarily of nitrogen and hydrogen with low levels of oxygen. The gases are collected by the vent header system from various primary and auxiliary systems.
Radioactive or potentially radioactive gaseous wastes result from collection of excess cover gas in the liquid holdup tanks, gases stripped from reactor coolant in the boric acid evaporator, degasification in the volume control tank, and cover gas displaced in the pressurizer relief tank and reactor coolant drain tank.
Each Unit's surge tank feeds that Unit's waste gas compressor and/or a shared spare compressor through a pressure control valve set to maintain constant compressor suction pressure. The system is designed such that the shared spare compressor will automatically start if the pressure in the surge tank rises above 3 psig. An oxygen monitor on the moisture separator discharge limits the concentration of oxygen that can be fed to the gas decay tanks. The monitor actuates an annunciator at 2 percent 02 concentration and trips the compressors at 4 percent 02 concentration.
The gas decay tanks are provided for the holdup of radioactive gases prior to release to the environment. The holdup time required is that which would result in releases that are in compliance with release rate and dose limits. Each gas decay tank may be operated as a cover gas supply for the liquid holdup tanks. Normal coolant letdown then displaces the gases back into the GRS. This process effectively increases the volume of storage available for gaseous holdup.
Each gas decay tank is equipped with a flow control valve connected to the plant vent.
The discharge of each valve is routed into a common flow control valve that is key-operated to ensure that no inadvertent venting may-take place. Downstream of the key-operated valve is a radiation monitor that controls a downstream control valve. If the activity in the discharging waste gas exceeds its upper limit, the control valve closes, terminating the release. The final processing of waste gas prior to release to the atmosphere is by a high-efficiency particulate air (HEPA) filter located just downstream of the radiation control valve and just upstream of the plant vent.
The sampling system associated with the GRS is used to monitor the hydrogen and oxygen content of the gases in the system. Thirteen sample points exist in this system Diablo Canyon Power Plant Page 3.1-8 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 including all influent sources and each of the gas decay tanks. These sample points may be monitored continuously, or intermittently as required, or grab samples may be taken from manual sample taps. The gas analyzer is equipped with a sample tap for taking bottled samples to undergo radiological testing.
3.1.3.2 Liquid Waste System Units 1 and 2 share a common Liquid Radwaste System (LRS), except for equipment located inside containment. The common waste system consists of the equipment drain subsystem, floor drain subsystem, chemical drain subsystem, laundry and hot shower and laundry/distillate subsystem, and the demineralizer regenerant subsystem.
The floor drain, chemical drain, laundry/distillate, laundry and hot shower, and demineralizer regenerant subsystems generally collect low radioactivity level liquid wastes. The equipment drain subsystem collects liquids with variable radioactivity levels. The demineralizer regenerant subsystem is also used as backup for the floor drain and equipment drain subsystem.
Following treatment, effluents from the LRS are released to the environment at either of the Units' circulating water system (CWS) discharge structures via the ASW system.
The waste liquid releases are diluted in the ASW system and Main CWS flows.
Releases require positive operator action, are continuously monitored, and are automatically isolated in the event of a high radiation alarm or a power failure.
A major source of radioactive waste liquids is the reactor coolant system (RCS). The bulk of these wastes are processed and retained within the chemical and volume control system (CVCS), with a fraction being discharged to the LRS.
The concentration of radioactivity in the turbine building drains is expected to be low, even in the event of significant primary-to-secondary steam generator leakage. The radiation concentration and flow of liquid from the turbine building drains are monitored at the oily water separator to verify that there are no unaccounted for or unexpected releases from the turbine building drains. If significant radioactivity is detected coming from the turbine building drains, the discharge can be routed to the LRS for treatment.
The monitoring system is in conformance with Regulatory Guide RG 1.21, Revision 0 (Reference 6).
Turbine building sump wastes are normally released to the environment via each Unit's circulating water discharge structure.
Equipment Drain or Closed Drain Subsystem The closed drain system is so called because drains from equipment are connected directly to the drainage system. Closed drain wastes are not exposed to the atmosphere until they reach their destination. Inside containment closed drain wastes Diablo Canyon Power Plant Page 3.1-9 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I flow to the reactor coolant drain tank. Closed drainage from equipment in the auxiliary building is collected in the miscellaneous equipment drain tank.
Floor Drains and Open Drain Subsystem The open drain system drains potentially contaminated areas in the containment buildings and the auxiliary building with equipment that does not normally handle reactor coolant. The piping systems and trenches used in this system are not enclosed.
Inside containment, floor drain wastes are collected in the containment sumps and the reactor cavity sump. Potentially contaminated auxiliary building floor drain wastes are collected in the auxiliary building sump. The uncontaminated floor drains from the auxiliary building drain to other discharge pathways such as the sanitary drainage system, outside, etc.
Chemical Drain Subsystem Chemical wastes are generated due to routine chemical and radiochemical sampling and analyses. Chemical wastes from both Units drain by gravity to a divided chemical drain tank. When one half of the tank is filled, flow is automatically diverted into the second half. The filled section is recirculated, sampled, and analyzed before further batch processing.
Laundry and Hot Shower, and Laundry/Distillate Subsystem Laundry and hot shower wastes are generally very low in activity. The laundry and hot shower wastes are generated by laundering contaminated protective clothing and by personnel decontamination. A source of waste is the liquid holdup tank liquid that is processed and drained to the laundry/distillate tank. When a holding tank is filled, the contents are recirculated, sampled, and analyzed before further batch processing or discharge.
Demineralizer Regenerant Subsystem The demineralizer regenerant subsystem consists of two 15,000 gallon demineralizer regenerant receivers (arranged in parallel) located adjacent to the equipment drain receivers in the auxiliary building. Regeneration wastes from the steam generator blowdown treatment system, deborating demineralizers, or evaporator distillate demineralizers are neutralized by concentrated sulfuric acid or sodium hydroxide in the demineralizer regenerant receivers. After neutralization, the waste is recirculated, sampled and analyzed before further batch processing.
The demineralizer regenerant receivers (formerly called spent regenerant receiver tanks) can also receive equipment or floor drain liquid and function as surge capacity for these systems. In addition, the liquid holdup tank liquid that is processed can be drained to the demineralizer regenerant receivers for additional processing.
Diablo Canyon Power Plant Page 3.1-10 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 3.1.3.3 Solid Waste Processing Systems The Solid Radwaste System (SRS) is designed to process, package, and store the radioactive wastes generated by plant operations until they are shipped offsite for permanent disposal at a licensed burial facility. The SRS has the following major subsystems: the spent filter/ion exchange media processing system, the spent resin processing system, the spent filter cartridge processing system, the mobile radwaste processing system (MRPS), and the dry active waste processing system.
Spent Resins Processing System The system for transferring spent resins from any of the ion exchangers to the spent resin storage tanks (SRSTs) consists of 4 separate headers connected to 4 eductors and discharge systems that permit the transfer of resin from any of the 30 ion exchanger units to either of 2 SRSTs. A spent resin sampling system allows for the collection of grab samples as resins enter the SRSTs or while the spent resins are being transferred out of the SRSTs to the MRPS.
All of the equipment associated with this system is potentially highly radioactive. The equipment is located behind shielding, and is approached for operation or maintenance only under the direction of plant radiation protection personnel under the special work permit rules of the plant.
Spent Filter/Ion Exchange Media Processing System Pressurized air is used to transfer exhausted media from either of the two radwaste media filters to the loadout station to which the MRPS container is connected.
Spent Filter Cartridge Processing System This system is designed to remove and handle spent filter cartridges generated in the filters of the CVCS, Spent Fuel Storage System, and LRS. The radioactively contaminated spent filter cartridges can be removed from the filter housing or vessels with the operator remaining behind shielding. The spent cartridges are transferred to storage or to the MRPS in shielded transfer casks.
Mobile Radwaste Processing System The MRPS is a skid-mounted mobile radwaste dewatering/solidification system. It is operated on a batch basis to solidify concentrates, to dewater or solidify spent ion exchange or filtration media, and to encapsulate spent cartridge filters. Waste concentrates are transferred to the MRPS through a flexible connection from the boric acid concentrates loadout station and solidified. Slurries from the media filter vessels are sluiced out to the MRPS and dewatered or solidified. Spent resin slurries are sluiced to the MRPS from the spent resin storage tank and dewatered or solidified.
Filter cartridges are transferred to the MRPS container in a shielded spent filter transfer cask, if required. Waste concentrates, ion exchange media, filtration media, and cartridge filters will be dewatered or solidified.
Diablo Canyon Power Plant Page 3.1-11 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Dry Active Waste Processing System Potentially radioactive dry wastes are collected at appropriate locations throughout the plant, as dictated by the volume of the wastes generated during operation or maintenance. The wastes are then segregated, processed, and packaged.
Compressible dry active wastes may be processed by compaction in either a drum or box compactor. During compaction, the airflow in the vicinity of the compactor is directed by the compactor exhaust fan through a high-efficiency particulate filter before it is discharged.
Large or highly radioactive components and equipment that have been contaminated during reactor operation and that are not amenable to compaction are handled either by qualified plant personnel or by outside contractors specializing in radioactive materials handling, and the components and equipment are packaged in shipping containers of an appropriate size and design.
3.1.4 TRANSPORTATION OF RADIOACTIVE MATERIALS The shipment of prepacked solid waste from the plant site to burial locations is contracted to firms licensed to transport radioactive material in accordance with applicable Department of Transportation regulations. All shipping containers and transportation casks are in conformance with 49 CFR 171 to 49 CFR 178 and 10 CFR 71, as applicable. On a,'verage, DCPP transprt. approxi.mately 620 ftc-ef radioeactive mnaterials offsitc annually.
3.1.5 NONRADIOACTIVE WASTE SYSTEMS Nonradioactive waste is produced from plant maintenance and cleaning processes.
Most of these wastes associated with plant operations are from secondary system chemistry control blowdown, condensate regeneration system spent resins and wastewaters, filter backwashes, sludges and other wastes removed from equipment during maintenance, floor and yard drains, and plant site stormwater runoff. Chemical and biocide wastes are produced from pH, scaling, and corrosion controls implemented for various closed-cycle cooling water systems. Water treatment chemical residuals also result from processes to clean and control fouling of the main steam condensers and associated water conduits. Waste liquids are typically combined with cooling water discharges in accordance with the National Pollutant Discharge Elimination System (NPDES) Permit.
Nonradioactive gaseous effluents result from combustion of diesel fuel-oil during maintenance, testing, and operation of the DCPP emergency diesel generators (EDGs).
Additionally, a fuel-oil fired auxiliary boiler unit is available to provide steam to heat the plant in the unlikely event of an extended dual Unit outage involving cold shutdown of both Units. The auxiliary boiler is not operated for routine maintenance or testing purposes. Discharge of regulated pollutants from fossil fuel combustion equipment is minimized by use of high grade ultra-low sulfur fuel, and limiting fuel usage and hours of operation in accordance with the San Luis Obispo County Air Pollution Control District Diablo Canyon Power Plant Page 3.1-12 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I (APCD) requirements. Additionally, emissions equipment operating permits incorporate standards that support local air quality goals.
3.1.6 MAINTENANCE, INSPECTION, AND REFUELING ACTIVITIES Various programs and activities currently exist at DCPP to maintain, inspect, test, and monitor the performance of plant equipment. These programs and activities include, but are not limited, to those implemented to:
" meet the requirements of 10 CFR 50, Appendix B (Quality Assurance), Appendix R (Fire Protection), and Appendices G and H, Reactor Vessel Materials; meet the requirements of 10 CFR 50.55a, ASME Code,Section XI, Inservice Inspection and Testing Requirements;
" meet the requirements of 10 CFR 50.65, the maintenance rule, including the structures monitoring program; and
" maintain water chemistry in accordance with EPRI guidelines.
Additional programs include those implemented to meet DCPP Technical Specifications surveillance requirements, those implemented in response to NRC generic communications, and various periodic maintenance, testing, and inspection procedures.
Certain program activities are performed during the operation of the Unit. Others are performed during scheduled refueling outages.
3.1.7 POWER TRANSMISSION LINES The Final Environmental Statement (FES) (Reference 2) identifies three single-circuit 500 kV and one double-circuit 230 kV transmission lines that were built to supply offsite power to DCPP and to connect DCPP to the electric grid. One double-circuit 230 kV line was connected to an existing Morro Bay-Mesa line 10.25 miles from DCPP with an 80-ft right-of-way width. One single-circuit 500 kV line was connected to the Gates Substation in Fresno County 79 miles from DCPP with a 350-ft right-of-way width.
Lastly, two single-circuit 500 kV lines were connected to the Midway Substation in Kern County 84 miles from DCPP with a combined right-of-way width of 400 ft. While originally built specifically to supply offsite power to DCPP and to connect DCPP to the electric grid, these transmission lines are now a critical part of PG&E's high voltage transmission system, providing other services in addition to those related to DCPP.
These transmission lines would remain energized regardless of a license renewal decision.
Subsequent to the publication of the FES, no additional transmission lines have been built to connect DCPP to the electric grid. Thus, in accordance with the 1996 GELS, the Diablo Canyon Power Plant Page 3.1-13 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I transmission lines of interest are those specified in the FES. Figure 3.1-6 is a map of the transmission systems of interest.
In 2014, PG&E submitted an updated Environmental Report. The updated Environmental Report discussions regarding transmission lines were not updated. In accordance with the revised GElS (NUREG-1437, Revision 1, Reference 8), since the transmission lines discussed in the FES would remain energized regardless of a license renewal decision, the transmission lines that connect the DCPP switchyard to the regional transmission system are no longer in the scope of the license renewal environmental review. These transmission lines are now a critical part of PG&E's high voltage transmission system, providing other services in addition to those related to DCPP. The only transmission lines remaining in the scope of the license renewal environmental review are those from the DCPP power block to the DCPP switchyard.
Therefore, any discussions regarding the DCPP transmission lines that connect the DCPP switchyard to the transmission system are provided for historical purposes and are not updated.
In total, for the specific purpose of connecting DCPP to the transmission system, PG&E has approximately 170 miles of corridor that occupy approximately 7,500 acres. The corridors pass primarily through foothills and rolling land. In addition, there are parcels of land that are agricultural and forest land. The areas are mostly remote. All lines, except the Morro Bay-Mesa feeder line, cross Highway 101.
The transmission lines were designed in the late 1960s and constructed in the early 1970s, in accordance with the State of California's Rules for Overhead Electric Line Construction (General Order 95, Reference 5) and industry guidance that were current when the lines were built. Ongoing surveillance and maintenance of the transmission facilities ensure continued conformance to design standards. These maintenance practices are described in Section 2.4 and Section 4.13.
Diablo Canyon Power Plant Page 3.1-14 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I 3.2 REFURBISHMENT ACTIVITIES NRC "The report must contain a description of... the applicant's plans to modify the facility or its administrative control procedures... This report must describe in detail the modifications directly affecting the environment or affecting plant effluents that affect the environment..." 10 CFR 51.53(c)(2)
"...The incremental aging management activities carried out to allow operation of a nuclear power plant beyond the original 40-year license term will be from one of two broad categories... (2) major refurbishment or replacement actions, which usually occur fairly infrequently and possibly only once in the life of the plant for any given item." (NRC 1996)
("SMITTR" is defined in NRC 1996 as surveillance, monitoring, inspections, testing, trending, and recordkeeping.)
PG&E has addressed potential refurbishment activities in this environmental report in accordance with NRC regulations and complementary information in the NRC Generic Environmental Impact Statement for License Renewal of Nuclear Plants (GELS) for license renewal (Reference 3). NRC requirements for the renewal of operating licenses for nuclear power plants include the preparation of an integrated plant assessment (IPA)
(10 CFR 54.21). The IPA must identify and list systems, structures, and components subject to an aging management review. Items that are subject to aging and might require refurbishment include, for example, the reactor vessel, piping, supports, and pump casings (see 10 CFR 54.21 for details), as well as those that are not subject to periodic replacement.
NRC regulations for implementing the National Environmental Policy Act require license renewal phase environmental reports to describe in detail and assess the environmental impacts of any major refurbishment activities such as planned major modifications to systems, structures, and components or plant effluents [10 CFR 51.53(c)(2)]. Resource categories to be evaluated for impacts of refurbishment include terrestrial resources, threatened or endangered species, air quality, housing, public utilities and water supply, education, land use, transportation, and historic and archaeological resources.
GElS Table B.2 lists license renewal refurbishment activities that NRC anticipated utilities might undertake. In identifying these activities, the GElS intended to encompass actions that typically take place only once, if at all, in the life of a nuclear plant. The GElS analysis assumed that a utility would undertake these activities solely for the purpose of extending plant operations beyond 40 years, and would undertake them during the refurbishment period. The GElS indicates that many plants will have undertaken various refurbishment activities to support the current license period, but that some plants might undertake such tasks only to support extended plant operations.
Diablo Canyon Power Plant Page 3.2-1 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I The DCPP IPA conducted by PG&E under 10 CFR 54 (included as part of the license renewal application) and the DCPP Plant Betterment Study (Reference 7) have not identified the need to undertake any major refurbishment or replacement actions to maintain the functionality of important systems, structures, or components during the DCPP license renewal period. Although routine plant operational and maintenance activities will be performed during the license renewal period, these activities are not refurbishments as described in Sections 2.4 and 3.1 of the GElS and will be managed in accordance with appropriate DCPP programs and procedures. These items are typical of those that occur during major refueling outages and the environmental impacts are enveloped by the Final Environmental Statement. Accordingly, PG&E has determined that license renewal regulations in 10 CFR 51.53(c)(3)(ii) do not require PG&E to assess the impact of refurbishment on plant and animal habitats, estimated vehicle emissions, housing availability, land use, public schools, or highway traffic on local highways. (See 10 CFR 51.53(c)(3)(ii)(E), (F), (I), (J), respectively.)
To maintain the functionality of important systems, structures, or components during the current operating period, DGPP PG&E completed replacement of the DCPP Unit 1 and 2 steam generators in 2008 and 2009, respectively. DGPP PG&E also replaced the DCPP Unit 1 reactor head in 2010 and the Unit 2 reactor head in 2009. The-Unit-I reactor head is schedued to be..
plac"d in" 2010. This replacement is-wasbeing completed for the current operating licenses and the environmental impacts are enveloped by the Final Environmental Statement for the current DCPP Operating Licenses.
Diablo Canyon Power Plant License Renewal Application Page 3.2-2
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I 3.4 EMPLOYMENT 3.4.1 CURRENT WORKFORCE PG&E employs approximately 4-350 1,440 employees at DCPP. This is within the range of 600 to 800 personnel per reactor Unit estimated in the GElS (Reference 3). Over 95 percent of DCPP employees live in San Luis Obispo County, California and Santa Barbara County. The remaining employees are distributed across 10 other counties in California with numbers ranging from 1 to 7 employees per county. None of the DCPP permanent workforce lives outside of California.
DCPP is on an 18-month refueling cycle. During refueling outages, site employment increases above the permanent workforce by as many as 1,200 for approximately 40 days of temporary duty. This number of temporary outage workers falls within the range (200 to 900 workers per reactor Unit) reported in the GElS for additional maintenance workers (Reference 3).
3.4.2 LICENSE RENEWAL INCREMENT Performing license renewal activities could necessitate increasing the DCPP staff workload by some increment. The size of this increment would be a function of the schedule within which PG&E must accomplish the work and the amount of work involved. Because PG&E has determined that no refurbishment is needed (Section 3.2), the analysis of license renewal employment increment focuses on programs and activities for managing the effects of aging (Section 3.3).
The GElS (Reference 3) assumes that NRC would renew a nuclear power plant license for a 20-year period, plus the duration remaining on the current license, and that NRC would issue the renewal approximately 10 years prior to license expiration. In other words, the renewed license would be in effect for approximately 30 years. The GElS further assumes that the utility would initiate surveillance, monitoring, inspection, testing, trending, and recordkeeping (SMITTR) activities at the time of issuance of the new license and would conduct license renewal SMITTR activities throughout the remaining 30-year life of the plant, sometime during full-power operation (Reference 3),
but mostly during normal refueling and the 5 and 10-year in-service inspection and refueling outages.
PG&E has determined that the GElS scheduling assumptions are reasonably representative of DCPP incremental license renewal workload scheduling. Many DCPP license renewal SMITTR activities would have to be performed during outages.
Although some DCPP license renewal SMITTR activities would be one-time efforts, others would be recurring periodic activities that would continue for the life of the plant.
The GElS estimates that the most additional personnel needed to perform license renewal SMITTR activities would typically be 60 persons during the 3-month duration of a 10-year inservice inspection and refueling outage. Having established this upper Diablo Canyon Power Plant Page 3.4-1 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 value for what would be a single event in 20 years, the GElS uses this number as the expected number of additional permanent workers needed per Unit attributable to license renewal. GElS Section C.3.1.2 uses this approach in order to "...provide a realistic upper bound to potential population-driven impacts..."
PG&E has identified no need for significant new aging management programs or major modifications to existing programs. PG&E anticipates that existing "surge" capabilities for routine activities, such as refueling outages, will enable PG&E to perform the increased SMITTR workload without increasing DCPP staff. Therefore, PG&E has no plans to add non-outage employees to support DCPP operations during the license renewal term. PG&E believes that increased SMITTR tasks can be performed within this schedule and employment level. Therefore, PG&E has no plans to provide additional refueling outage employees for the license renewal term.
Diablo Canyon Power Plant Page 3.4-2 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1
3.5 REFERENCES
- 1.
Diablo Canyon Power Plant Units 1 & 2 Final Safety Analysis Report Update, Revision 18, Pacific Gas and Electric Company, October 2008.
- 2.
Final Environmental Statement related to operation of Diablo Canyon Power Plant Units 1 and 2. U.S. Atomic Energy Commission. Pacific Gas and Electric Company, Docket Nos. 50-275 and 50-323. May 1973.
- 3.
NUREG-1437: Generic Environmental Impact Statement for License Renewal of Nuclear Plants (GELS), Volumes 1 and 2. U.S. Nuclear Regulatory Commission.
Washington, D.C. May 1996.
- 4.
Final Environmental Impact Report: Diablo Canyon Power Plant Steam Generator Replacement Proiect. Prepared by Aspen Environmental Services for Pacific Gas and Electric Company. 2005.
- 5.
State of California's Rules for Overhead Electric Line Construction: General Order 95. Prescribed by the Public Utilities Commission of the State of California
- 6.
Regulatory Guide 1.21: Measuring, Evaluating, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from Light-water-cooled Nuclear Power Plants, U.S. Nuclear Regulatory Commission. Washington, D.C., December 1971.
- 7.
Plant Betterment Study. Pacific Gas and Electric Company. Revision 0.
September 2009.
- 8.
NUREG-1437: Generic Environmental Impact Statement for License Renewal of Nuclear Plants (GELS). U.S. Nuclear Regulatory Commission, Revision 1, Washington, DC, June 2013.
- 9.
NUREG-1437: Generic Environmental Impact Statement for License Renewal of Nuclear Plants (GEIS), U.S. Nuclear Regulatory Commission, Revision 1, Washington, DC, June 2013.
Diablo Canyon Power Plant Page 3.5-3 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 CHAPTER 4 - ENVIRONMENTAL CONSEQUENCES OF THE PROPOSED ACTION AND MITIGATING ACTIONS NRC "The report must contain a consideration of alternatives for reducing adverse impacts...for all Category 2 license renewal issues...." 10 CFR 51.53(c)(3)(iii)
"...The environmental report shall include an analysis that considers...the environmental effects of the proposed action... and alternatives available for reducing or avoiding adverse environmental effects....." 10 CFR 51.45(c) as adopted by 10 CFR 51.53(c)(2) and 10 CFR 51.53(c)(3)(iii)
The environmental report shall discuss "The impact of the proposed action on the environment. Impacts shall be discussed in proportion to their significance;" 10 CFR 51.45(b)(1) as adopted by 10 CFR 51.53(c)(2)
"...The information submitted...should not be confined to information supporting the proposed action but should also include adverse information." 10 CFR 51.45(e) as adopted by 10 CFR 51.53(c)(2) 4.0.1 DISCUSSION OF 1996 GElS LICENSE RENEWAL CATEGORIES Chapter 4 presents an assessment of the environmental consequences and potential mitigating actions associated with the renewal of the Diablo Canyon Power Plant (DCPP) operating license. The NRC has prepared a Generic Environmental Impact Statement for License Renewal of Nuclear Plants (GELS) (Reference 18), which identifies and analyzes 92 environmental issues that the NRC considers to be associated with nuclear power plant license renewal. In its analysis, the NRC designated each of the 92 issues as Category 1, Category 2, or NA (not applicable) and required plant-specific analysis of only the Category 2 issues.
The NRC designated an issue as Category 1 if, based on the result of its analysis, the following criteria were met:
" the environmental impacts associated with the issue have been determined to apply either to all plants or, for some issues, to plants having a specific type of cooling system or other specified plant or site characteristic,
- a single significance level (i.e., small, moderate, or large) has been assigned to the impacts that would occur at any plant, regardless of which plant is being evaluated (except for collective offsite radiological impacts from the fuel cycle and from high-level waste and spent fuel disposal), and Diablo Canyon Power Plant Page 4.0-1 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 mitigation of adverse impacts associated with the issue has been considered in the analysis, and it has been determined that additional plant-specific mitigation measures are likely to be not sufficiently beneficial to warrant implementation.
Absent new and significant information (Chapter 5), the NRC rules do not require analyses of Category 1 issues because the NRC resolved them using generic findings presented in 10 CFR 51, Appendix B, Table B-I. An applicant may reference the generic findings or GElS analyses for Category 1 issues.
If the NRC analysis concluded that one or more of the Category 1 criteria could not be met, the issue was assigned as Category 2. The NRC requires plant-specific analyses for Category 2 issues. The NRC designated 2 issues as "NA" (Issues 60 and 92),
signifying that the categorization and impact definitions do not apply to these issues.
Attachment A of this report lists the 92 issues and identifies the environmental report section that addresses each issue and, where appropriate, references supporting analyses in the GELS.
Category I License Renewal Issues NRC "The environmental report for the operating license renewal stage is not required to contain analyses of the environmental impacts of the license renewal issues identified as Category 1 issues in Appendix B to subpart A of this part." 10 CFR 51.53(c)(3)(i)
"...[A]bsent new and significant information, the analysis for certain impacts codified by this rulemaking need only be incorporated by reference in an applicant's environmental report for license renewal...."
(NRC 1996)
Pacific Gas and Electric Company (PG&E) has determined that, of the 69 Category 1 issues, 10 do not apply to DCPP because they apply to design or operational features that do not exist at the facility. In addition, because PG&E does not plan to conduct any major refurbishment activities, the NRC findings for the 7 Category 1 issues that pertain -
only to refurbishment do not apply to this application. PG&E has reviewed the NRC Category 1 findings and has identified no new and significant information that would make the NRC findings inapplicable to DCPP. Therefore, PG&E adopts by reference the NRC findings for these Category 1 issues.
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APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Category 2 License Renewal Issues NRC "The environmental report must contain analyses of the environmental impacts of the proposed action, including the impacts of refurbishment activities, if any, associated with license renewal and the impacts of operation during the renewal term, for those issues identified as Category 2 issues in Appendix B to subpart A of this part...." 10 CFR 51.53(c)(3)(ii)
"The report must contain a consideration of alternatives for reducing adverse impacts, as required by § 51.45(c), for all Category 2 license renewal issues...." 10 CFR 51.53(c)(3)(iii)
The NRC designated 21 issues as Category 2. Sections 4.1 through 4.20 address each of these issues (Section 4.17 addresses 2 issues), beginning with a statement of the issue. As is the case with Category 1 issues, 6 Category 2 issues apply to operational features that DCPP does not have. In addition, 8 Category 2 issues apply only to refurbishment activities or to scenarios involving additional employment for managing plant aging. PG&E does not plan any refurbishment or additional employment. If an issue does not apply to DCPP, the section explains the basis for inapplicability.
For the 7 Category 2 issues that PG&E has determined to be applicable to DCPP, analyses are provided. These analyses include conclusions regarding the significance of the impacts relative to the renewal of the operating license for DCPP and, when applicable, discuss potential mitigative alternatives. PG&E has identified the significance of the impacts associated with each issue as either Small, Moderate, or Large, consistent with the criteria that the NRC established in 10 CFR 51, Appendix B, Table B-1, Footnote 3 as follows:
SMALL - Environmental effects are not detectable or are so minor that they will neither destabilize nor noticeably alter any important attribute of the resource. For the purposes of assessing radiological impacts, the Commission has concluded that those impacts that do not exceed permissible levels in the Commission's regulations are considered small.
MODERATE - Environmental effects are sufficient to alter noticeably, but not to destabilize, any important attribute of the resource.
LARGE - Environmental effects are clearly noticeable and are sufficient to destabilize any important attributes of the resource.
In accordance with National Environmental Policy Act practice, PG&E considered ongoing and potential additional mitigation in proportion to the significance of the impact Diablo Canyon Power Plant Page 4.0-3 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I to be addressed (i.e., impacts that are small receive less mitigative consideration than impacts that are large).
"NA" License Renewal Issues The NRC determined that its categorization and impact-finding definitions did not apply to two issues (Issues 60 and 92); however, PG&E included these issues in Attachment A. Applicants currently do not need to submit information on chronic effects from electromagnetic fields (10 CFR 51, Appendix B, Table B-1, Footnote 5). For environmental justice, the NRC does not require information from applicants, but noted that it will be addressed in individual license renewal reviews (10 CFR 51, Appendix B, Table B-1, Footnote 6). PG&E has included minority and low-income demographic information in Section 2.6.2.
4.0.2 DISCUSSION OF UPDATED GElS LICENSE RENEWAL CATEGORIES As described in Section 1.2, on June 20, 2013, the NRC published a final rule (78 FR § 37282) revising its environmental protection regulation, 10 CFR 51, and the associated GELS. The final rule identified 78 environmental impact issues, of which 19 require plant-specific analysis. The final rule consolidated similar Category I and 2 issues, changed some Category 2 issues into Category 1 issues, and consolidated some of those issues with existing Category 1 issues. The final rule also added new Category I and 2 issues. Since new issues were not included in the 1996 GELS, they were not addressed in the original DCPP Environmental Report for License Renewal.
The following are new Category I issues:
Geology and Soils Because of DCPP's geologic setting, a new Section has been developed (Section 2.13).
This includes discussion of the regional and site geology, soils, and seismic setting.
According to the revised GELS, the impact of geologic and soil conditions on plant operations and the impact of continued power plant operations and refurbishment activities on geology and soils are SMALL for all nuclear power plants and not expected to change appreciably during the license renewal term. Industry operating experience shows that any impacts to geologic and soil strata would be limited to soil disturbance from construction activities associated with routine infrastructure renovation and maintenance projects during continued plant operations. As discussed in Section 3.2, PG&E has no plans for refurbishment or other license renewal-related construction activities at DCPP. Therefore, any incremental impacts on geology and soils during the license renewal term would be SMALL.
Exposure of Terrestrial Organisms to Radionuclides Section 3.1.3 describes the DCPP radioactive waste treatment processes to control radioactive effluent discharges to ensure that they comply with NRC regulations.
Chapter 5 contains information related to the DCPP radiological environmental monitoring programs. PG&E has not identified any new and significant information related to the exposure of terrestrial organisms to radionuclides. Based on review of the Diablo Canyon Power Plant Page 4.0-4 License Renewal Application
APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 DCPP radioactive effluent and radiological environmental monitoring program reports, PG&E concludes that the impacts from radioactive effluents to terrestrial organisms would be SMALL.
Exposure of Aquatic Organisms to Radionuclides Section 3.1.3 describes the DCPP radioactive waste treatment processes to control radioactive effluent discharges to ensure that they comply with NRC regulations.
Chapter 5 contains information related to the DCPP radiological environmental monitoring programs. PG&E has not identified any new and significant information related to the exposure of aquatic organisms to radionuclides. Based on review of the DCPP radioactive effluent and radiological environmental monitoring program reports, PG&E concludes that the impacts from radioactive effluents to aquatic organisms would be SMALL.
Human Health Impact from Chemicals DCPP maintains an inventory of industrial process chemicals and has a Hazardous Waste Facility Permit for the storage of hazardous waste on site. DCPP employees receive hazardous materials training and are trained in hazardous waste procedures, spill contingencies, waste minimization procedures, and, for applicable personnel, treatment, storage, and disposal facility training. Training is conducted in accordance with the Occupation Safety and Health Administration (OSHA) Hazard Communication Standard and 22 California Code of Regulations (CCR). PG&E developed a comprehensive Worker Health and Safety Program to ensure adherence to applicable OSHA and NRC standards. The human health impacts from chemical hazards are expected to be minimized through DCPP's use of good industrial hygiene practices as required by permits and Federal and State regulations. Therefore, chemical impacts to human health during continued plant operations would be SMALL.
Physical Occupational Hazards DCPP has existing procedures on industrial safety that address safety standards, and minimization of risks through the use of engineering controls, design controls, administrative controls, personnel protection equipment, and safe work practices. The impacts from physical hazards to plant workers will be of small significance if workers adhere to safety standards and use protective equipment as required by Federal and State regulations. Therefore, the impacts from physical occupational hazards during continued plant operations would be SMALL.
The following are new Category 2 issues:
Radionuclides Released to Groundwater As discussed in Chapter 5, tritium groundwater sampling was initiated at DCPP in 2003 through the Radiological Environmental Monitoring Program (REMP). Results of this monitoring program are submitted to local, State, and Federal agencies on an annual basis.
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APPENDIX E ENVIRONMENTAL REPORT AMENDMENT I Based on the assessments and environmental staff evaluation discussed in Chapter 5, it was concluded that the potential for the communication of contaminated waters originating at the DCPP site with domestic water supplies regulated, owned, managed, or certified by State and Local governmental bodies does not exist. Therefore, impacts associated with tritium found in groundwater are determined to be SMALL.
Effects on Terrestrial Resources (Non-Cooling System Impacts)
With respect to terrestrial organisms, the final rule amends Table B-1 in Appendix B, Subpart A, to 10 CFR Part 51 by expanding the Category 2 issue, "Refurbishment impacts," among others, to include normal operations, refurbishment, and other supporting activities during the license renewal term. This issue remains a Category 2 issue with an impact level range of SMALL to LARGE; however, the final rule renames this issue, "Effects on terrestrial resources (non-cooling system impacts)." Section 2.4 describes the terrestrial resources on and in the vicinity of DCPP, and Section 2.5 describes protected species and habitats. As discussed in Sections 4.9 and 4.10, PG&E has no plans for refurbishment or other license renewal-related construction activities at DCPP. DCPP operations have had a small impact on terrestrial ecosystems. The impacts to terrestrial ecosystems from continued plant operations and maintenance are expected to be unchanged and SMALL.
Minority and Low-Income Populations (i.e., Environmental Justice)
Section 2.6.2 provides a discussion of minority and low-income populations within a 50-mile radius of the site. Section 4.21 evaluates the impact on environmental justice based on renewal of the DCPP operating licenses and concludes that no unique disproportionately high or adverse impacts on minority and low-income populations would occur as a result of continued plant operations. PG&E concludes impacts to minority and low-income populations would be SMALL.
Cumulative Impacts In this section, past, present, and reasonably foreseeable future actions that take place in the vicinity of DCPP are identified and possible cumulative effects are discussed.
The geographic area affected by cumulative impacts depends on the resource being impacted (Reference 20).
Past, present, and reasonably foreseeable actions may include individually minor but collectively significant actions taking place over a period of time because the SMALL impacts of minor actions, when considered in combination with the impacts of other actions, could result in MODERATE or LARGE cumulative impacts to the affected resource (Reference 20).
As indicated in Section 2.12, 12 industrial facilities within the 80-km (50-mi) radius of DCPP have National Pollutant Discharge Elimination System (NPDES) permits (Reference 23). As shown in Table 2.10-1, San Luis Obispo County is designated as a nonattainment area for the ozone National Ambient Air Quality Standards (NAAQS), a nonattainment area for the annual PM1 o NAAQS, and an attainment area for all other NAAQS (Reference 21).
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APPENDIX E ENVIRONMENTAL REPORT AMENDMENT 1 Electrical power generation sources within 80 km (50 mi) of DCPP include two natural gas power plants (9.8 MW total), four hydroelectric power plants (5.94 MW total), three solar installations (677.64 MW total), and one landfill gas installation (1.48 MW total)
(Reference 22).
As discussed in Section 2.3, the groundwater source at DCPP is geologically isolated to the DCPP watershed, and is therefore not hydraulically connected to other area groundwater resources.
Threatened or endangered species, critical habitats, and cultural resources are protected by state and federal regulations. Cumulative impacts to water quality, aquatic and terrestrial resources, groundwater, threatened or endangered species or critical habitats have been small throughout the current period of DCPP operation and are expected to remain SMALL.
Cumulative impacts from releases to air or water have been small in the 80-km (50-mi) radius surrounding DCPP because the California Environmental Protection Agency (calEPA) regulates emissions and discharges through permits and are expected to remain SMALL.
Sections 2.6 through 2.9 describe the aspects of the region's socioeconomics that could be affected by renewal of the DCPP operating licenses. As discussed in Section 3.4, PG&E does not anticipate adding additional staff during the license renewal term, but the environmental report's analyses conservatively assume an additional 60 staff could be added to implement aging management programs. PG&E also evaluated the anticipated temporary workforce during refueling outages. The analyses looked at impacts to housing, public water supply, transportation, and, in the case of refurbishment, education, and determined that all impacts would be SMALL.
Radiological dose limits for protection of the public and workers have been developed by calEPA and NRC to address the cumulative impacts of acute and long-term exposure to radiation and radioactive material, regardless of the source or sources.
These dose limits are codified in 10 CFR Part 20 and 40 CFR Part 190. These impacts, which previously have been SMALL, will remain SMALL through the license renewal term.
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